scholarly journals Low-carbohydrate diet induces metabolic depression: a possible mechanism to conserve glycogen

2017 ◽  
Vol 313 (4) ◽  
pp. R347-R356 ◽  
Author(s):  
Hugh S. Winwood-Smith ◽  
Craig E. Franklin ◽  
Craig R. White
Keyword(s):  
Physical Activity ◽  
Weight Loss ◽  
Metabolic Rate ◽  
Metabolic Depression ◽  
Carbohydrate Diet ◽  
Low Carbohydrate Diet ◽  
Low Carbohydrate ◽  
Glycogen Stores ◽  
Over Time

Long-term studies have found that low-carbohydrate diets are more effective for weight loss than calorie-restricted diets in the short term but equally or only marginally more effective in the long term. Low-carbohydrate diets have been linked to reduced glycogen stores and increased feelings of fatigue. We propose that reduced physical activity in response to lowered glycogen explains the diminishing weight loss advantage of low-carbohydrate compared with low-calorie diets over longer time periods. We explored this possibility by feeding adult Drosophila melanogaster a standard or a low-carbohydrate diet for 9 days and measured changes in metabolic rate, glycogen stores, activity, and body mass. We hypothesized that a low-carbohydrate diet would cause a reduction in glycogen stores, which recover over time, a reduction in physical activity, and an increase in resting metabolic rate. The low-carbohydrate diet reduced glycogen stores, which recovered over time. Activity was unaffected by diet, but metabolic rate was reduced, in the low-carbohydrate group. We conclude that metabolic depression could explain the decreased effectiveness of low-carbohydrate diets over time and recommend further investigation of long-term metabolic effects of dietary interventions and a greater focus on physiological plasticity within the study of human nutrition.

scholarly journals Flight activity and glycogen depletion on a low-carbohydrate diet

2020 ◽  
Vol 223 (14) ◽  
pp. jeb228379
Author(s):  
Hugh S. Winwood-Smith ◽  
Craig R. White ◽  
Craig E. Franklin
Keyword(s):  
Physical Activity ◽  
Flight Activity ◽  
Metabolic Depression ◽  
Glycogen Depletion ◽  
Carbohydrate Diet ◽  
Low Carbohydrate Diet ◽  
Low Carbohydrate ◽  
Time Periods ◽  
Glycogen Stores ◽  
Increased Activity

ABSTRACTGlycogen is a critical store for locomotion. Depleted glycogen stores are associated with increased fatigue during exercise. The reduced effectiveness of low-carbohydrate diets for weight loss over longer time periods may arise because such diets reduce glycogen stores and thereby energy expenditure via physical activity. To explore the effect of a low-carbohydrate diet on activity and glycogen utilisation, we fed adult Drosophila melanogaster a standard or low-carbohydrate diet for 9 days and measured patterns of flight activity and rates of glycogen depletion. We hypothesised that flight activity and rates of glycogen depletion would be reduced on a low-carbohydrate diet. Flight activity was elevated in the low-carbohydrate group but glycogen depletion rates were unchanged. We conclude that increased activity is probably a foraging response to carbohydrate deficiency and speculate that the previously demonstrated metabolic depression that occurs on a low-carbohydrate diet in this species may allow for increased flight activity without increased glycogen depletion.

scholarly journals Beyond “Counting Macros”: Are Common Fad Diets Nutritionally Adequate? An Examination of Their Micronutrient Content

2020 ◽  
Vol 4 (Supplement_2) ◽  
pp. 1823-1823
Author(s):  
Neal Malik ◽  
Serena Tonstad ◽  
Ella Haddad
Keyword(s):  
Weight Loss ◽  
Disease Risk ◽  
Controlled Trial ◽  
Carbohydrate Diet ◽  
High Fiber ◽  
Low Carbohydrate Diet ◽  
Funding Sources ◽  
Low Carbohydrate ◽  
Calcium Magnesium

Abstract Objectives We compared a high-fiber bean-rich diet with a low-carbohydrate diet in a randomized controlled trial to assess their effects on body weight, blood lipids and micronutrient adequacy. Methods One hundred and seventy-three women and men with a mean body mass index of approximately 36 kg · m−2 were randomized to a high-fiber bean-rich diet that achieved mean (SD) fiber intakes of 35.5 (18.6) g · day−1 for women and 42.5 (30.3) g · day−1 for men, or a low-carbohydrate diet (<120 g · day−1). Both diets were induced gradually over 4 weeks and included a 3-day feeding phase. Results After 52 weeks, the low-carbohydrate (n = 24) group tended to retain weight loss better than the high-fiber group (n = 30) (P = 0.06), although total cholesterol remained lower with the bean-rich diet (P = 0.049). The low-carbohydrate group consumed more vitamin K (P = 0.006), thiamin (P = 0.001), and niacin (P = 0.02) whereas those in the high-fiber group consumed more folate (P = 0.006), magnesium (P = 0.046) and copper (P = 0.017). Both groups consumed less than the RDA for vitamin D, vitamin E, calcium, magnesium and copper. Conclusions A high-fiber bean-rich diet was as effective as a low-carbohydrate diet for weight loss. However, both diets were deficient in micronutrients. These results may have implications for long-term disease risk and morbidity management. Funding Sources Lifestyle Center of America (Sulphur, OK).

scholarly journals Alternate Day Fasting Combined with a Low Carbohydrate Diet: Effect on Sleep Quality, Duration, Insomnia Severity and Risk of Obstructive Sleep Apnea in Adults with Obesity

Nutrients ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 211
Author(s):  
Faiza Kalam ◽  
Kelsey Gabel ◽  
Sofia Cienfuegos ◽  
Mark Ezpeleta ◽  
Eric Wiseman ◽  
...  
Keyword(s):  
Weight Loss ◽  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Sleep Quality ◽  
Weight Maintenance ◽  
Carbohydrate Diet ◽  
Low Carbohydrate Diet ◽  
Obstructive Sleep ◽  
Low Carbohydrate ◽  
Insomnia Severity

Background: Alternate day fasting combined with a low carbohydrate diet (ADF-LC) is an effective weight loss regimen. Whether the weight loss induced by ADF-LC can improve sleep, remains unknown. Objective: This study examined the effect an ADF-LC diet on sleep quality, duration, insomnia severity and the risk of obstructive sleep apnea. Methods: Adults with obesity (n = 31) participated in ADF (600 kcal “fast day”; ad libitum intake “feast day”) with a low-carbohydrate diet (30% carbohydrates, 35% protein, and 35% fat). The 6-month trial consisted of a 3-month weight loss period followed by a 3-month weight maintenance period. Results: Reductions in body weight (−5 ± 1 kg, p < 0.001) and fat mass (−4 ± 1 kg, p < 0.01) were noted during the weight loss period, and these reductions were sustained during the weight maintenance period. Lean mass and visceral fat remained unchanged. The Pittsburgh Sleep Quality Index (PSQI) score indicated poor sleep quality at baseline (6.4 ± 0.7) with no change by month 3 or 6, versus baseline. ISI score indicated subthreshold insomnia at baseline (8.5 ± 1.0), with no change by month 3 or 6, versus baseline. The percent of subjects with high risk of obstructive sleep apnea at baseline was 45%, with no change by month 3 or 6. Wake time, bedtime, and sleep duration remained unchanged. Conclusion: The ADF-LC diet does not impact sleep quality, duration, insomnia severity or the risk of obstructive sleep apnea in adults with obesity.

scholarly journals Adherence to a Low Carbohydrate Diet may Modify Resting Metabolic Rate among Overweight and Obese Women

2020 ◽  
Author(s):  
Seyedeh Forough Sajjadi ◽  
Atieh Mirzababaei ◽  
nasim Ghodoosi ◽  
Sara Pooyan ◽  
Hana Arghavani ◽  
...  
Keyword(s):  
Metabolic Rate ◽  
Resting Metabolic Rate ◽  
Fat Free Mass ◽  
Obese Women ◽  
Carbohydrate Diet ◽  
Cross Sectional ◽  
Low Carbohydrate Diet ◽  
Low Carbohydrate ◽  
Carb Diet ◽  
Adjusted Model

Abstract Objective Resting metabolic rate (RMR) accounts for most of the daily energy expenditure. The low-carb diet attenuates decreases in RMR. This study aims to investigate the relationship between a low-carb diet and resting metabolic rate status. Methods We enrolled 304 overweight and obese women in this cross-sectional study. BMI, fat mass, fat-free mass, visceral fat, insulin level were assessed. RMR was measured using indirect calorimetry. A low carbohydrate diet score was measured using a validated semi-quantitative food frequency questionnaire (FFQ). Results Our results showed no relationship between LCDS and DNR even after adjust for confounders (Inc. RMR: OR: 0.97; 95% CI: 0.92–1.01, P = 0.20; Dec. RMR: OR: 0.97; 95% CI: 0.94-1.00, P = 0.14). Some components of LCDS had significant differences with DNR, such as carbohydrate and Dec. RMR in adjusted model (OR: 1.62; 95% CI: 0.98–1.37, P = 0.08), MUFA and Dec. RMR in adjusted model (OR: 0.48; 95% CI: 0.21–1.10, P = 0.08) and refined grain and Inc. RMR in crude model (OR: 0.87; 95% CI: 0.77–0.99, P = 0.04). Conclusion Our study showed that there is no association between a low-carb diet and RMR status but carbohydrate, MUFA, and refined grain had a significant relationship.

scholarly journals A very low carbohydrate diet and increased physical activity improve LDL particle size in individuals taking statins

2010 ◽  
Vol 24 (S1) ◽  
Author(s):  
Erin E Quann ◽  
Kevin D Ballard ◽  
Brian R Kupchak ◽  
Carl M Maresh ◽  
William J Kraemer ◽  
...  
Keyword(s):  
Physical Activity ◽  
Particle Size ◽  
Carbohydrate Diet ◽  
Ldl Particle Size ◽  
Low Carbohydrate Diet ◽  
Low Carbohydrate

Abstract P072: Low-Carbohydrate-Diets and Cardiovascular and Total Mortality in Japanese. A 29-year Follow-up of NIPPON DATA80

Circulation ◽  
2014 ◽  
Vol 129 (suppl_1) ◽  
Author(s):  
Yasuyuki Nakamura ◽  
Nagako Okuda ◽  
Tomonori Okamura ◽  
Aya Kadota ◽  
Naoko Miyagawa ◽  
...  
Keyword(s):  
Cox Model ◽  
Total Mortality ◽  
Noncommunicable Disease ◽  
Carbohydrate Diet ◽  
Low Carbohydrate Diet ◽  
Asian Populations ◽  
Low Carbohydrate ◽  
Study Participants

Background: Long-term safety of low-carbohydrate-diets in Asian populations, whose carbohydrate intake is relatively high, is not known. Methods: We examined the association of low-carbohydrate-diets with CVD and total mortality using the National Integrated Project for Prospective Observation of Noncommunicable Disease and Its Trends in the Aged, (NIPPON DATA80) database with a 29-year follow-up. At the baseline in 1980, data were collected on study participants ages≥30 years from randomly selected areas in Japan. We calculated low-carbohydrate-diet scores based on the percentage of energy as carbohydrate, fat, and protein, estimated by 3-day weighed food records. We followed 9,200 participants (56% women, mean age 51 y). Results: During the follow-up, there were 1,171 CVD deaths (52% in women), and 3,443 total deaths (48% in women). The multivariate-adjusted hazard ratio (HR) for CVD mortality using the Cox model comparing highest versus lowest deciles for a low-carbohydrate-diet score was 0.59 (95% confidence interval [CI], 0.38-0.92, trend P=0.019) for women; 0.74 (95% CI: 0.55-0.99, trend P=0.033) for women and men combined; HR for total mortality was 0.73 (95% CI: 0.57-0.93, trend P=0.020) for women; 0.84 (95% CI: 0.72-0.99, trend P=0.030) for women and men combined. None of the associations in men alone were statistically significant. We did not note any differential effects between animal and plant based low-carbohydrate-diets. Conclusions: Moderate diets lower in carbohydrate and higher in protein and fat were significantly inversely associated with CVD and total mortality in women, and women and men combined.

scholarly journals Effects of a low carbohydrate diet on energy expenditure during weight loss maintenance: randomized trial

BMJ ◽  
2018 ◽  
pp. k4583 ◽  
Author(s):  
Cara B Ebbeling ◽  
Henry A Feldman ◽  
Gloria L Klein ◽  
Julia M W Wong ◽  
Lisa Bielak ◽  
...  
Keyword(s):  
Weight Loss ◽  
Energy Expenditure ◽  
Total Energy ◽  
Total Energy Expenditure ◽  
Carbohydrate Diet ◽  
Intention To Treat ◽  
Low Carbohydrate Diet ◽  
High Carbohydrate ◽  
Low Carbohydrate ◽  
Treat Analysis

AbstractObjectiveTo determine the effects of diets varying in carbohydrate to fat ratio on total energy expenditure.DesignRandomized trial.SettingMulticenter collaboration at US two sites, August 2014 to May 2017.Participants164 adults aged 18-65 years with a body mass index of 25 or more.InterventionsAfter 12% (within 2%) weight loss on a run-in diet, participants were randomly assigned to one of three test diets according to carbohydrate content (high, 60%, n=54; moderate, 40%, n=53; or low, 20%, n=57) for 20 weeks. Test diets were controlled for protein and were energy adjusted to maintain weight loss within 2 kg. To test for effect modification predicted by the carbohydrate-insulin model, the sample was divided into thirds of pre-weight loss insulin secretion (insulin concentration 30 minutes after oral glucose).Main outcome measuresThe primary outcome was total energy expenditure, measured with doubly labeled water, by intention-to-treat analysis. Per protocol analysis included participants who maintained target weight loss, potentially providing a more precise effect estimate. Secondary outcomes were resting energy expenditure, measures of physical activity, and levels of the metabolic hormones leptin and ghrelin.ResultsTotal energy expenditure differed by diet in the intention-to-treat analysis (n=162, P=0.002), with a linear trend of 52 kcal/d (95% confidence interval 23 to 82) for every 10% decrease in the contribution of carbohydrate to total energy intake (1 kcal=4.18 kJ=0.00418 MJ). Change in total energy expenditure was 91 kcal/d (95% confidence interval −29 to 210) greater in participants assigned to the moderate carbohydrate diet and 209 kcal/d (91 to 326) greater in those assigned to the low carbohydrate diet compared with the high carbohydrate diet. In the per protocol analysis (n=120, P<0.001), the respective differences were 131 kcal/d (−6 to 267) and 278 kcal/d (144 to 411). Among participants in the highest third of pre-weight loss insulin secretion, the difference between the low and high carbohydrate diet was 308 kcal/d in the intention-to-treat analysis and 478 kcal/d in the per protocol analysis (P<0.004). Ghrelin was significantly lower in participants assigned to the low carbohydrate diet compared with those assigned to the high carbohydrate diet (both analyses). Leptin was also significantly lower in participants assigned to the low carbohydrate diet (per protocol).ConclusionsConsistent with the carbohydrate-insulin model, lowering dietary carbohydrate increased energy expenditure during weight loss maintenance. This metabolic effect may improve the success of obesity treatment, especially among those with high insulin secretion.Trial registrationClinicalTrials.govNCT02068885.

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