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PubMed2004

Dose-response relationships between energy availability and bone turnover in young exercising women.

UNLABELLED: To help refine nutritional guidelines for military servicewomen, we assessed bone turnover after manipulating the energy availability of 29 young women. Bone formation was impaired by less severe restrictions than that which increased bone resorption. Military servicewomen and others may need to improve their nutrition to avoid these effects. INTRODUCTION: We determined the dose-response relationship between energy availability (defined as dietary energy intake minus exercise energy expenditure) and selected markers of bone turnover in 29 regularly menstruating, habitually sedentary, young women of normal body composition. MATERIALS AND METHODS: For 5 days in the early follicular phase of two menstrual cycles separated by at least 2 months, subjects expended 15 kcal/kgLBM/day in supervised exercise at 70% of aerobic capacity and consumed controlled amounts of a clinical dietary product in balanced (45 kcal/kgLBM/day) and one of three restricted (either 10, 20, or 30 kcal/kgLBM/day) energy availability treatments in random order. Blood was sampled at 10-minute intervals, and urine was collected for 24 h. Samples were assayed for plasma osteocalcin (OC), serum type I procollagen carboxy-terminal propeptide (PICP), and urinary N-telopeptide (NTX). RESULTS: NTX concentrations (p < 0.01) and indices of bone resorption/formation uncoupling (Z(NTX-OC) and Z(NTX-PICP); both p < 10(-4)) were increased by the 10 kcal/kgLBM/day treatment. OC and PICP concentrations were suppressed by all restricted energy availability treatments (all p < 0.05). PICP declined linearly (p < 10(-6)) with energy availability, whereas most of the suppression of OC occurred abruptly between 20 and 30 kcal/kgLBM/day (p < 0.05). CONCLUSIONS: These dose-response relationships closely resembled those of particular reproductive and metabolic hormones found in the same experiment and reported previously: similar relationships were observed for NTX and estradiol; for PICP and insulin; and for OC, triiodothyronine (T3), and insulin-like growth factor (IGF)-I. The uncoupling of bone resorption and formation by severely restricted energy availability, if left to continue, may lead to irreversible reductions in BMD, and the suppression of bone formation by less severe restrictions may prevent young women from achieving their genetic potential for peak bone mass. More prolonged experiments are needed to determine the dose-response relationships between chronic restrictions of energy availability and bone turnover.

Adult↗

PubMedDate not supplied

Riboflavin status of nutritionally supported multiple-trauma accident patients.

This study evaluates riboflavin status of multiple-trauma accident patients receiving nutritional support. Riboflavin excretion, erythrocyte glutathione reductase (EGR-AC), erythrocyte riboflavin (ERC-B2), nitrogen balance and riboflavin, and nitrogen and energy intake were assessed periodically throughout the study. Mean intakes of nitrogen, energy, and riboflavin were less than recommended. All patients but one were in negative nitrogen balance; however, patients retained riboflavin except when nitrogen and energy intakes were very low. EGR-AC values were within normal range and did not reflect changes in riboflavin retention. ERC-B2 values were also within normal range but decreased over time in patients with the largest riboflavin excretion and most negative nitrogen balance. ERC-B2 in combination with riboflavin intake and excretion data may offer a suitable method for assessing riboflavin status in multiple-trauma patients.

Adult↗

PubMed1990

Seasonal energy deficiency in Ethiopian rural women.

The purpose of the study was to establish the existence of seasonal exposure to energy deficiency in rural areas of developing countries and to investigate the sequence of appearance and the nature of energy-sparing mechanisms utilized under real life conditions. The body weight of a group of 226 rural Ethiopian women was measured repeatedly over a one year period, at 45 day intervals. On a sub-group of 22 non-pregnant women total energy intake, TEI, total energy expenditure, TEE, and basal metabolic rate, BMR were also measured by the precise weighing method and by indirect calorimetry (Kofranyi-Michaelis respirometer or Douglas bag) and activity diaries. Body weight was found to have a moderate but statistically significant seasonal trend, with an overall loss of 1.6 kg. Women with higher BMI had larger seasonal swings of their body weight. Seasonal fluctuations were also found for TEI (maximum difference 420 kcal/d, not significant), and for BMR (maximum difference 200 kcal/day, P less than 0.000). TEE (mean yearly value of 1909 kcal/d, 42 kcal/kg) was very stable over the year and did not show any seasonal fluctuation. The present findings suggest that, under the study circumstances, seasonal exposure to fluctuation in food availability caused a moderate weight loss which was sufficient to induce metabolic adaptations, but not to cause any detectable change in physical activity.

Adaptation, Physiological↗

PubMed2002

Weight-loss attempts and reporting of foods and nutrients, and biomarkers in a national cohort.

OBJECTIVE: This study examined the reported intake of foods and nutrients, and biomarkers of dietary exposure and cardiovascular disease in relation to history of trying to lose weight. METHODS: Dietary, anthropometric and biochemical data were from the third National Health and Nutrition Examination Survey (1988-1994), n=13 092. The history of attempting weight loss variable was created as follows: trying to lose currently and tried in the past 12 months (Y/Y); trying to lose currently, but not tried in the past 12 months (Y/N), not trying currently, but tried in the past 12 months (N/Y); not trying now and not tried in the past 12 months (N/N). Multiple regression methods were used to examine the independent association of history of trying to lose weight with reported intakes of energy, nutrients, percentage energy from low-nutrient-dense foods (sweeteners, baked and dairy desserts, visible fats and salty snacks), and serum concentrations of vitamins, carotenoids and lipids. RESULTS: Men and women in the Y/Y group reported lower energy intake relative to the N/N group (P<0.0000). However, the reported percentage energy from fat and carbohydrate by the Y/Y group did not differ from the N/N group. Percentage of energy from low-nutrient-dense foods was lower in men in the Y/Y group but not women. The relative odds of reporting the estimated average requirement (EAR) of folate, and vitamins A, B(6), B(12), C, E and iron and adequate intake (AI) of calcium were not adversely affected by history of trying to lose weight in men. In women, the odds of meeting the folate and vitamin E EAR were lower in the Y/Y group. Some history of weight loss categories were significant positive predictors of serum vitamin and carotenoid concentrations, or unrelated to cardiovascular disease risk biomarkers. CONCLUSIONS: There was little evidence for increased nutritional risk in those reporting repeat attempts at weight loss.

Adult↗

PubMed2000

Dietary habits and nutritional status in adolescents over Europe--Southern Europe.

A literature review of the data on dietary habits, food consumption and nutritional status of adolescents of Southern European countries was performed. Snacking seems to be less frequent and the frequency of eating out in fast food restaurants is much lower than in the USA and in some Nordic Countries. A nutrient pattern rich in total fat (around 40% of the energy intake), in saturated fatty acids (around 13% of the energy intake) and mainly in monounsaturated fatty acids (17-19% of the energy intake), due to a high consumption of olive oil, is often observed in Spanish and Greek adolescents. In Portugal, the percentage of the energy provided by fat is relatively low (31-33% of the energy intake) and in Italy the situation is intermediate regarding total fat, but the intake of olive oil is also high. This means that two important characteristics of the Mediterranean diet, a low consumption of saturated fatty acids and a high intake of carbohydrates have been lost. Regarding micronutrients, there seems to exist a risk of deficiency, particularly for calcium, iron and zinc. The prevalence of overweight/obesity is high, around 15-25%, being higher than in the Nordic countries but lower than in the USA. There is no clear indication of trends, due to the different methods and criteria used to define obesity. The serum cholesterol levels of adolescents has increased during the last two decades in Spain, Greece and Italy, and nowadays are similar to those in the USA, but still lower than in the Nordic countries. In Portuguese adolescents, the cholesterol levels seem to be lower, but the situation is not well known.

Adolescent↗

PubMed2006

Effect of ghrelin in dry matter intake and energy metabolism in prepartum sheep: a preliminary study.

The objective of this study was to determine the effect of ghrelin on dry matter intake and energy metabolites in ewes during the last 10d of gestation. Ewes were randomly assigned to either a treatment (n=6) or a control group (n=6). One hour after feeding (08:00 and 16:00), ewes in the treated group were given ovine ghrelin (3 microg/kg, i.m.) and the control group received an equivalent volume of saline. Treatments were continued until lambing. Daily blood samples were taken starting at assignment. The principal findings were that: (1) ewes treated with ghrelin had a higher dry matter intake only on the first day of treatment; (2) treated ewes had lower serum concentrations of non-esterified fatty acids and insulin but higher serum concentrations of growth hormone; (3) serum concentrations of beta-hydroxy butyrate and cortisol were not different between treated and non-treated ewes. In conclusion, treatment with ghrelin affected dry matter intake and energy metabolites of pre-partum ewes during the last 10 d of pregnancy.

3-Hydroxybutyric Acid↗

PubMed1986

Effects of short-term caloric restriction on lactational performance of well-nourished women.

Milk volume and composition, nutrient intake and plasma prolactin levels of 22 well-nourished lactating women were measured during a 3-week period; an experimental group (E, n = 14) reduced energy intake by 19 to 53% (mean 32%) during week 2 while controls (C, n = 8) maintained normal intake. Mean maternal energy intakes (kcal/day) were: (E) 2316 (wk 1), 1591 (wk 2); (C) 2037, 2121. Mean infant milk intakes (g/day) during these weeks were: (E) 736, 718, 684; (C) 714, 671, 702. Milk intake was not reduced among infants of mothers whose energy intakes were at least 1500 kcal/day during week 2. In group E prolactin levels tended to increase during week 2. Milk composition did not change significantly. Lower energy intakes than those currently recommended appear compatible with successful lactation and gradual maternal weight loss, but longer-term studies are needed to determine a lower limit for safe intakes.

Adult↗

PubMed1997

Is the low-fat message giving people a license to eat more?

In the past decade, technology for modifying the fat content of foods has progressed and led to the development of highly palatable low-fat foods. Many Americans believe that weight loss can be accomplished by eating an ad libitum low-fat diet, and the development of highly palatable foods that are low in fat provides welcome additions to the food supply. However, in order to maintain high palatability, some of these foods have added sugars and other energy-bearing substances resulting in some low-fat foods which remain high in energy content and are energy-dense. Using such products as substitutes for higher-fat versions of foods is likely to bring about only small reductions in energy intake. A better strategy to reduce energy intake is to consume a low-fat diet made up of low-energy density foods such as fruits, vegetables, and other foods high in fiber and complex carbohydrates. Such a diet may include fat-replaced foods which are also reduced in energy since, for weight loss, a sustained reduction in energy intake is necessary. This can be best accomplished by eating a balanced diet not only low in fat content but also lower in energy.

Diet, Fat-Restricted↗

PubMed2001

Effects of glucose supplementation on gastric emptying, blood glucose homeostasis, and appetite in the elderly.

The aims of this study were to evaluate the effects of dietary glucose supplementation on gastric emptying (GE) of both glucose and fat, postprandial blood glucose homeostasis, and appetite in eight older subjects (4 males, 4 females, aged 65--84 yr). GE of a drink (15 ml olive oil and 33 g glucose dissolved in 185 ml water), blood glucose, insulin, gastric inhibitory polypeptide (GIP) and glucagon-like peptide-1 (GLP-1), and appetite (diet diaries, visual analog scales, and food intake at a buffet meal consumed after the GE study) were evaluated twice, after 10 days on a standard or a glucose-supplemented diet (70 g glucose 3 times a day). Glucose supplementation accelerated GE of glucose (P < 0.05), but not oil; there was a trend for an increase in GIP (at 15 min, P = 0.06), no change in GLP-1, an earlier insulin peak (P < 0.01), and a subsequent reduction in blood glucose (at 75 min, P < 0.01). Glucose supplementation had no effect on food intake during each diet so that energy intake was greater (P < 0.001) during the glucose-supplemented diet. Appetite ratings and energy intake at the buffet meal were not different. We conclude that, in older subjects, glucose supplementation 1) accelerates GE of glucose, but not fat; 2) modifies postprandial blood glucose homeostasis; and 3) increases energy intake.

Aged↗

PubMed1989

Nutrient intake and growth performance of older infants fed human milk.

STUDY OBJECTIVE: To determine whether the ad libitum addition of solid foods to the diet of exclusively human milk-fed infants will increase energy intake and reverse the decline in weight-for-age percentiles observed during the exclusive breast-feeding period. DESIGN: Weekly or biweekly measures of growth were made longitudinally on a cohort of infants from birth to 36 weeks of age, and monthly measures of nutrient intake were made from 16 weeks of age until 10 weeks after solid foods were introduced into the diet. SUBJECTS: Volunteer mother-infant pairs from middle and upper income groups who met entry criteria, including the intention to breast-feed exclusively for at least for 16 weeks; 58 pairs entered and 45 pairs completed the study. INTERVENTION: Solid foods were introduced at a time determined by the mother and the pediatrician; solid foods from controlled lot numbers were provided for each infant. MEASUREMENTS AND MAIN RESULTS: After solid foods were added, daily human milk intake declined at a rate of 77 gm/mo (p less than 0.001). Milk composition did not change during the observation period. Daily total energy intake increased 29 kcal/mo, but no changes were noted in energy intake when consumption was normalized for body weight. Weight (National Center for Health Statistics percentiles) at 28 weeks was 13 percentiles lower than that at birth, and length at 28 weeks was 1 percentile lower than at week 1. Weight and length percentiles at 28 weeks, when compared with peak values at 8 weeks, had dropped 19 and 14 percentiles, respectively. CONCLUSIONS: Energy intake of human milk-fed infants did not increase after solid foods were added to their diet but was maintained at approximately 20% below recommended levels. Energy intake appeared to reflect infant demands. These data suggest that the recommendations for the energy requirements of infancy should be reevaluated. The growth pattern of exclusively breast-fed infants differs from that of the National Center for Health Statistics reference population. These observations raise questions about the adaptive response of human milk-fed infants to different levels of energy intake and about the estimations of energy requirements based on the sum of basal metabolism, activity, growth, and diet-induced thermogenesis.

Body Weight↗

PubMed1998

Fitness and the effect of exercise training on the dietary intake of healthy adolescents.

OBJECTIVE: In healthy, nonobese, adolescent males and females to: (1) Determine the relationship between fitness and energy intake; (2) assess the effect of five-weeks endurance training on energy intake and food choice and (3) compare food record assessments of energy intake with doubly-labeled water (DLW) measurement of total energy expenditure (TEE). DESIGN: (1) Cross sectional analysis of fitness and food intake and (2) Prospective, randomized, controlled interventional study of endurance-type exercise training in 44 females and 44 males (age range, 15-17 y). MEASUREMENTS: Pre and end interventional three day food records were successfully collected from 32 females (15 controls, 17 trained) and 39 males (19 controls, 20 trained). Fitness was assessed from cycle ergometry as peak oxygen uptake normalized both to thigh muscle mass and body weight. Thigh muscle mass was measured by magnetic resonance imaging. TEE using the DLW technique was measured in 12 females (6 controls, 6 trained) and 20 males (10 controls, 10 trained) during weeks 4-5 of the exercise training program (simultaneously with the second assessment of food records). Food record data were analyzed using the Minnesota Nutrition Data System. RESULTS: Fitness was correlated with self reported total caloric intake in males but not females. In females, there was a significant increase in fat intake (19.8+/-9%, P < 0.05) and a significant decrease in carbohydrate intake (-9.8+/-4%) in the trained subjects. No changes were observed in the control subjects. Energy expenditure (2072+/-52 kcal/d) was significantly greater than the estimated energy intake (1520+/-112 kcal/d, P < 0.007) during the intervention in the trained, but not control, subjects. However, there was no weight change in either control or trained subjects. In males, no changes were observed in food choice in either control or trained subjects. Similar to the females, energy expenditure (2425+/-22 kcal/d) was significantly greater than the estimated energy intake (2168+/-117 kcal/d, P < 0.05) during the intervention in the trained, but not control, subjects. No weight changes were observed in either group. CONCLUSIONS: Fitness is associated with increased self-reported energy intake in males but not females, while exercise training led to alterations in food selection (greater fat and reduced carbohydrate) only in females. These observations could reflect specific gender differences, or, alternatively, the generally lower levels of fitness in the females. The apparent negative energy balance without evidence for weight loss in both the trained males and females suggests a systematic under reporting of food intake during exercise programs in adolescents, and indicates the possibility that errors in self reported food intake might be greater during transitions from one level of energy expenditure to another.

Adolescent↗

PubMed1982

The energy and nutrient intake of a random sample (305) of infants.

The intake of energy and nutrients in the diets of 305 children between 3 months and 2 yr of age has been measured. The children lived in Glasgow, an economically deprived area of the UK, and were randomly selected from birth registers to represent the different social groups in the community. Food intake was measured by weighing each item of food or drink taken by each individual during 5 consecutive d. The energy intakes showed males to have higher intakes then females. There was almost no variation due to social group, except that the most-favoured groups had the lowest intakes, although this was significant only in the females below 1 yr of age. The influence of fatness and fat-free mass on energy intake is described. The intakes of energy and protein were lower than the recommended amounts but no evidence of malnutrition was detected. Prevalence of breast-feeding in the different social groups is shown. Findings of possibly some importance in relation to calcium and iron are described.

Age Factors↗

PubMed1994

Relations between parental mealtime practices and children's food intake.

The food intake of children aged 3-7 years was related to selected parental and child mealtime behaviours from video recordings of meals in 50 Swedish families and a 7-day weighed record of dietary intake from 39 of these. The children's mean intakes of fat and sucrose were relatively high (23% of energy from sugar-rich snacks) and their energy intake and number of meals were evenly distributed over the day. No relationship between energy intake and overweight was found. Children spent 50% of the total mealtime eating. One-third of all child mealtime behaviours were verbal. Most parental behaviours were verbal with negative, non-eating statements about the child being very common and negatively correlated with child energy intake. The child's energy intake was positively correlated with the child taking food on recommendation by the parent. The results indicate parental influences on children's eating which may have implications for the development of food preferences and overweight in childhood.

Adult↗

PubMed2004

Outcomes associated with enteral tube feedings in a medical intensive care unit.

UNLABELLED: BACKGROUND Underfeeding of patients reliant on enteral tube feedings most likely is due primarily to interruptions in the infusions. Strategies to improve energy intake require an understanding of such interruptions and associated outcomes. OBJECTIVES: To compare daily energy intake with goal energy intake; to ascertain frequency, duration, and reasons for interruptions in feedings, and to determine occurrences of feeding intolerance. METHODS: A prospective, descriptive study of a convenience sample of patients admitted during a 3-month period to a medical intensive care unit. Patients were included who were expected to receive continuous enteral tube feedings for at least 48 hours. Patients were studied until discontinuation of feedings, discharge from the unit, or death. RESULTS: Thirty-nine patients were studied for 276 feeding days. Patients received a mean of 64% of goal energy intake. Mean length of interruptions in feeding was 5.23 hours per patient per day. Interruptions for performance of tests and procedures accounted for 35.7% of the total cessation in feeding time. Next most time-consuming interruptions occurred with changes in body position (15%), unstable clinical conditions (13.5%), high gastric residual volume (11.5%), and nausea and vomiting (9.2%). Patients had diarrhea 105 (38%) of 276 feeding days. Gastric residual volumes exceeded 150 mL on 28 measurements in 11 patients. Five patients experienced episodes of nausea and vomiting. Four patients experienced an episode of feeding aspiration. CONCLUSIONS Precautionary interruptions in enteral feedings to decrease presumed risk of aspiration occurred frequently and resulted in underfeeding. Episodes of vomiting and of aspiration were uncommon.

Adult↗

PubMed1987

Dietary fibre: mechanisms of action.

Actions of dietary fibre in the gut may be important in the control of energy intake and energy digestibility. These include effects on gastric emptying, upper small gut motility, rates and completeness of carbohydrate, fat and protein absorption in the gut. The ileal brake, whereby fat in the terminal ileum slows upper gut motility and inhibits ad-lib food intake, demands further investigation. Energy digestibility may be important, but large changes of fibre intake result in only small changes in digestibility. Gastrointestinal hormone release which may be affected by fibre is another topic for further investigation, and the effect of some types of fibre in reducing postprandial blood glucose and insulin levels, and thereby increasing insulin sensitivity, may be important for lipolysis and lipogenesis.

Dietary Fiber↗

PubMed2004

Influence of methylphenidate on eating in obese men.

OBJECTIVE: Rapid synaptic dopamine transport or reduced brain dopamine receptor signaling may influence energy intake. Methylphenidate, a dopamine reuptake inhibitor, increases brain synaptic dopamine and produces anorexia, suggesting that it may reduce energy intake. We investigated the effects of two doses of short-acting methylphenidate on energy intake over one meal in obese adult males. RESEARCH METHODS AND PROCEDURES: Nine obese males (>85th BMI percentile) ingested a placebo or a moderate dose (0.5 mg/kg) or a high dose (1.0 mg/kg) of methylphenidate in a within-subject double-blind acute laboratory study. One hour after ingestion, pizza consumption was measured in a naturalistic laboratory setting. RESULTS: Participants reduced energy intake by 23% for the moderate dose vs. the placebo (p < 0.02), but there was no significant difference for the high dose vs. the moderate dose (p > 0.05). Participants consumed 34% fewer kilocalories after ingesting the lowest effective dose of methylphenidate compared with placebo (725.7 +/- 404.5 vs.1095 +/- 271.1 kcal, p < 0.01). Seven of nine subjects responded to the moderate dose. The increase in perceived drug effect above placebo was correlated with the reduction in energy intake for both the moderate (r = -0.85, p = 0.004) and the high (r = -0.75 p = 0.021) doses. Hunger scores were not different across drug doses or placebo before drug administration. DISCUSSION: Methylphenidate reduced energy intake of a highly palatable food over one meal by one-third in obese adult males. Dopamine transport inhibition may be an effective component of a comprehensive treatment for obesity.

Adult↗

PubMed1984

[Mechanisms of regulation of energy balance].

To establish energy balance, the three distinct terms of the balance must be precisely defined and measured. These terms are: the energy input by food intake, energy expenditure as heat and the body energy content in the form of lean and fat masses. The constancy of this fat store, generally associated with that of body weight, is an indication of the balance between energy intake and the sum of expenditure and non-lipidic energy retention. This balance is only carried out at medium or long-term. It results from the initiation of mechanisms regulating strongly positive or negative short-term balances between gains and losses. Four possible models of this regulation are presented and discussed using experimental data. A number of works is reported, demonstrating the role played by two complementary mechanisms of regulation. The first one is neuroendocrine mechanism controlling food intake and adjusting it to the input and output of glucose in the blood compartment. The second one is an autonomous mechanism regulating the body fat mass. It corrects, at medium and long-term, the filling and depletion of the adipose compartment which result from imbalances in the overall energy balance. This mechanism indirectly affects food intake in a regulatory sense. It is neurally controlled by the sympathetic and parasympathetic nervous system and governed by the medioventral nuclei of the hypothalamus.

Adipose Tissue↗

PubMed1995

Exercise and the neurobiological control of food intake and energy expenditure.

Knowledge of the effects of exercise in the regulation of energy balance is imperative for the assessment of the value (or limit) of exercise as a therapeutic adjunct in the treatment of obesity. This short review addresses the effects of exercise on the neurobiological control of food intake and energy expenditure. It has been proposed that exercise may affect the regulation of energy balance through the stimulation of corticotropin-releasing hormone (CRH) and neuropeptide Y (NPY). It is likely that the CRH and NPY neuropeptidergic systems exert some degree of control on food intake and energy expenditure. The increase in the CRHergic activity induced by moderately intense exercise would potentiate the effects of muscular activity in reducing energy stores by decreasing energy intake and increasing thermogenesis. Reduced food intake and increased thermogenesis are two of the more recognized biological actions of CRH. Exercise would also contribute to the stimulation of brain NPY neurons by reducing energy stores and plasma insulin levels. By producing orexigenic effects and reducing thermogenesis, activation of the NPY system would tend to oppose the physiological effects of CRH and therefore cancel out the effects of exercise on energy loss.

Body Temperature Regulation↗