scholarly journals Efficacy and consequences of very-high-protein diets for athletes and exercisers

2011 ◽  
Vol 70 (2) ◽  
pp. 205-214 ◽  
Author(s):  
Kevin D. Tipton
Keyword(s):  
Protein Intake ◽  
High Protein Diet ◽  
Kidney Damage ◽  
High Protein ◽  
Absolute Amount ◽  
Negative Consequences ◽  
High Protein Intake ◽  
High Protein Diets ◽  
Protein Diets ◽  
Very High

Athletes and exercisers have utilised high-protein diets for centuries. The objective of this review is to examine the evidence for the efficacy and potential dangers of high-protein diets. One important factor to consider is the definition of a ‘high-protein diet’. There are several ways to consider protein content of a diet. The composition of the diet can be determined as the absolute amount of the protein (or other nutrient of interest), the % of total energy (calories) as protein and the amount of protein ingested per kg of body weight. Many athletes consume very high amounts of protein. High-protein diets most often are associated with muscle hypertrophy and strength, but now also are advocated for weight loss and recovery from intense exercise or injuries. Prolonged intake of a large amount of protein has been associated with potential dangers, such as bone mineral loss and kidney damage. In otherwise healthy individuals, there is little evidence that high protein intake is dangerous. However, kidney damage may be an issue for individuals with already existing kidney dysfunction. Increased protein intake necessarily means that overall energy intake must increase or consumption of either carbohydrate or fat must decrease. In conclusion, high protein intake may be appropriate for some athletes, but there are potential negative consequences that must be carefully considered before adopting such a diet. In particular, care must be taken to ensure that there is sufficient intake of other nutrients to support the training load.

scholarly journals High dietary protein decreases fat deposition induced by high-fat and high-sucrose diet in rats

2015 ◽  
Vol 114 (8) ◽  
pp. 1132-1142 ◽  
Author(s):  
Catherine Chaumontet ◽  
Patrick C. Even ◽  
Jessica Schwarz ◽  
Angélique Simonin-Foucault ◽  
Julien Piedcoq ◽  
...  
Keyword(s):  
Protein Intake ◽  
Fatty Acid Synthase ◽  
Fat Deposition ◽  
High Protein ◽  
Oral Glucose ◽  
High Fat ◽  
High Protein Intake ◽  
High Protein Diets ◽  
Protein Diets ◽  
High Sucrose

AbstractHigh-protein diets are known to reduce adiposity in the context of high carbohydrate and Western diets. However, few studies have investigated the specific high-protein effect on lipogenesis induced by a high-sucrose (HS) diet or fat deposition induced by high-fat feeding. We aimed to determine the effects of high protein intake on the development of fat deposition and partitioning in response to high-fat and/or HS feeding. A total of thirty adult male Wistar rats were assigned to one of the six dietary regimens with low and high protein, sucrose and fat contents for 5 weeks. Body weight (BW) and food intake were measured weekly. Oral glucose tolerance tests and meal tolerance tests were performed after 4th and 5th weeks of the regimen, respectively. At the end of the study, the rats were killed 2 h after ingestion of a calibrated meal. Blood, tissues and organs were collected for analysis of circulating metabolites and hormones, body composition and mRNA expression in the liver and adipose tissues. No changes were observed in cumulative energy intake and BW gain after 5 weeks of dietary treatment. However, high-protein diets reduced by 20 % the adiposity gain induced by HS and high-sucrose high-fat (HS-HF) diets. Gene expression and transcriptomic analysis suggested that high protein intake reduced liver capacity for lipogenesis by reducing mRNA expressions of fatty acid synthase (fasn), acetyl-CoA carboxylase a and b (Acaca and Acacb) and sterol regulatory element binding transcription factor 1c (Srebf-1c). Moreover, ketogenesis, as indicated by plasma β-hydroxybutyrate levels, was higher in HS-HF-fed mice that were also fed high protein levels. Taken together, these results suggest that high-protein diets may reduce adiposity by inhibiting lipogenesis and stimulating ketogenesis in the liver.

scholarly journals Inhibitory effect of high protein intake on nephrocalcinogenesis in female rats

1992 ◽  
Vol 67 (2) ◽  
pp. 223-233 ◽  
Author(s):  
J. G. H. Sterck ◽  
J. Ritskes-Hoitinga ◽  
A. C. Beynen
Keyword(s):  
Protein Intake ◽  
Inhibitory Effect ◽  
High Protein ◽  
Female Rats ◽  
High Protein Intake ◽  
Low Protein ◽  
Background Diet ◽  
Calcium Magnesium ◽  
High Protein Diets ◽  
Protein Diets

Increased intakes of protein have been shown to reduce kidney calcification (nephrocalcinosis) in female rats. Two questions were addressed in the present study. First, can protein-induced inhibition of nephrocalcinosis be demonstrated when the diets used are balanced for calcium, magnesium and phosphorus in the added protein? Second, can the protein effect be explained by the frequently observed magnesiuria after giving high-protein diets? Nephrocalcinosis was induced in female rats by giving purified diets containing 151 g casein/kg and either an increased concentration of P (6 v. 2 g/kg) or a decreased concentration of Mg (0·1 v. 0·4 g/kg). To these diets 151 g ovalbumin/kg was added at the expense of glucose, and the diets were balanced for Ca, Mg and P in ovalbumin. The diets were given for 29 d. In rats fed on the diet containing 151 g protein/kg, an increased intake of P or a decreased intake of Mg caused nephrocalcinosis as measured chemically by analysis of kidney Ca as well as histologically by scoring kidney sections stained according to Von Kossa's method. The addition of ovalbumin to the diet prevented the induction of nephrocalcinosis. High P intake and low Mg intake with the low-protein diets induced enhanced loss of albumin in urine, suggesting that nephrocalcinosis caused kidney damage. Increased protein intake with a non-calcinogenic diet also caused increased albumin excretion in urine. Irrespective of the composition of the background diet, increased protein intake caused increased urinary excretion of Mg. When all dietary groups were considered, differences in nephrocalcinosis and urinary Mg output were not proportionally related.Nephrocalcinosis: Phosphorus: Magnesium: Protein: Rat

Renal glutamine metabolism in rats fed high-protein diets.

1978 ◽  
Vol 235 (3) ◽  
pp. E261 ◽  
Author(s):  
J T Brosnan ◽  
P McPhee ◽  
B Hall ◽  
D M Parry
Keyword(s):  
Protein Intake ◽  
Phosphoenolpyruvate Carboxykinase ◽  
Sodium Bicarbonate Solution ◽  
Ammonia Excretion ◽  
High Protein Diet ◽  
High Protein ◽  
Protein Diet ◽  
Glutamine Metabolism ◽  
High Protein Diets ◽  
Protein Diets

The influence of protein intake on acid excretion and renal glutamine metabolism was investigated and compared to the effects of NH4Cl-induced metabolic acidosis. Rats fed a diet containing 55% casein excreted more ammonia, phosphate, sulphate, and chloride than did rats fed a 13% casein diet, but, when they were given an 0.1 M NaHCO3 solution to drink, ammonia excretion was no longer elevated. Renal phosphate-dependent glutaminase and phosphoenolpyruvate carboxykinase activities, ammoniagenesis by isolated mitochondria, and the rate of renal gluconeogenesis were all elevated in the rats fed the high-protein diet but not if these rats also drank the sodium bicarbonate solution. Increased glutaminase and phosphoenolpyruvate carboxykinase activities, mitochondrial ammoniagenesis, and gluconeogenesis were all evident in rats made acidotic with NH4Cl. It is concluded that these metabolic adaptations evident in the kidneys of rats fed the high-protein diet are due to the acidogenic effects of increased protein intake.

scholarly journals The Effects of High-Protein Diets on Kidney Health and Longevity

2020 ◽  
Vol 31 (8) ◽  
pp. 1667-1679 ◽  
Author(s):  
Gang-Jee Ko ◽  
Connie M. Rhee ◽  
Kamyar Kalantar-Zadeh ◽  
Shivam Joshi
Keyword(s):  
Dietary Protein ◽  
Protein Intake ◽  
Observational Studies ◽  
Animal Protein ◽  
High Protein ◽  
High Protein Intake ◽  
High Protein Diets ◽  
Protein Diets ◽  
Kidney Health

Although high-protein diets continue to be popular for weight loss and type 2 diabetes, evidence suggests that worsening renal function may occur in individuals with—and perhaps without—impaired kidney function. High dietary protein intake can cause intraglomerular hypertension, which may result in kidney hyperfiltration, glomerular injury, and proteinuria. It is possible that long-term high protein intake may lead to de novo CKD. The quality of dietary protein may also play a role in kidney health. Compared with protein from plant sources, animal protein has been associated with an increased risk of ESKD in several observational studies, including the Singapore Chinese Health Study. Potential mediators of kidney damage from animal protein include dietary acid load, phosphate content, gut microbiome dysbiosis, and resultant inflammation. In light of such findings, adopting current dietary approaches that include a high proportion of protein for weight reduction or glycemic control should be considered with care in those at high risk for kidney disease. Given the possibility of residual confounding within some observational studies and the conflicting evidence from previous trials, long-term studies including those with large sample sizes are warranted to better ascertain the effects of high protein intake on kidney health.

scholarly journals High protein diet: benefits and risks

2021 ◽  
Vol 17 (4) ◽  
pp. 393-400
Author(s):  
M. V. Altashina ◽  
E. V. Ivannikova ◽  
E. A. Troshina
Keyword(s):  
Cardiovascular Diseases ◽  
High Protein Diet ◽  
High Protein ◽  
Protein Diet ◽  
Eating Patterns ◽  
Nonalcoholic Fatty Liver ◽  
High Protein Diets ◽  
Protein Diets ◽  
Mineral Bone Density

The nature of human nutrition has become increasingly important as an effective element in the prevention and treatment of many pathologies, especially obesity, type 2 diabetes and cardiovascular diseases. High protein diets are some of the most popular eating patterns and the Dukan diet has taken the lead in popularity among the diets of this type. An increase of protein in the diet is effective in reducing body weight, primarily due to the loss of adipose tissue, without a significant effect on muscle mass. Another advantage of a high-protein diet is earlier and longer satiety compared to other diets, which makes it comfortable for use. Besides obesity, high protein diets are presumably effective for treating such diseases as nonalcoholic fatty liver disease, diabetes mellitus and cardiovascular diseases However, despite the important advantages, this nutritional model is not universal and is contraindicated in patients with diseases of liver, kidneys and osteoporosis. Besides, the prolonged use of a high protein diet may increase the risks of urolithiasis and reduced mineral bone density even for healthy individuals. Thus, the increase in the proportion of protein in the diet should take place exclusively under the supervision of a physician.

Effect of adrenalectomy and hypophysectomy on responses of rat liver enzymes to high-protein diets

1968 ◽  
Vol 46 (10) ◽  
pp. 1253-1260 ◽  
Author(s):  
R. A. Freedland
Keyword(s):  
Enzyme Activity ◽  
Rat Liver ◽  
Liver Enzymes ◽  
High Protein Diet ◽  
High Protein ◽  
Protein Diet ◽  
Metabolic Function ◽  
Simple Pattern ◽  
High Protein Diets ◽  
Protein Diets

Although many enzymes are increased by either a high-protein diet or cortisol adminstration, there was no evidence of a glucocorticoid requirement for the high-protein mediated increases. This was particularly noticeable for enzymes markedly increased by feeding a high-protein diet. Neither adrenalectomy nor hypophysectomy prevented the diet-mediated increases, although in certain instances the responses were decreased. Many enzymes which were unaffected or decreased in the intact rat by feeding a high-protein diet had markedly different responses after endocrine removal. There did not appear to be a general or simple pattern of these altered responses. Therefore predictions on possible activity changes could not be made, except for those enzymes normally increased by a high-protein diet on the basis of metabolic function or hormonal effects. Possible hormonal controls of these changes in enzyme activity are discussed.

scholarly journals Body niacin status in diabetes mellitus: Effect of protein level in a ration

1994 ◽  
Vol 40 (1) ◽  
pp. 41-43
Author(s):  
R Ye Sadykova ◽  
V M Kodentsova ◽  
A V Dreval
Keyword(s):  
Diabetes Mellitus ◽  
Protective Effect ◽  
Protein Level ◽  
Alloxan Diabetes ◽  
High Protein Diet ◽  
High Protein ◽  
High Dose ◽  
Nicotinamide Coenzymes ◽  
High Protein Diets ◽  
Protein Diets

Administration of a high-protein diet providing 7-7.8 g of tryptophan per kg of the ration to rats with streptozotocin and alloxan diabetes mellitus resulted in development of a trend to increased liver content of nicotinamide coenzymes and in increased 1-methylnicotinamide excretion with the urine in both groups of animals, this reflecting increased niacin synthesis from tryptophan. Sugar-reducing effect of high-dose nicotinamide was not potentiated by increase of protein share in the ration. These results permitted the authors to suggest that intensification of endogenous niacin synthesis from tryptophan contained in the ration may be one of the mechanisms of a protective effect of high- protein diets in diabetes.

scholarly journals Thermogenic effect and substrate oxidation of protein from animal and plant sources in adults

2015 ◽  
Vol 11 (3) ◽  
pp. 136
Author(s):  
Ahmed Fahmy Arif Tsani ◽  
Lee Myung Joo ◽  
Kim Eun Kyung
Keyword(s):  
Weight Loss ◽  
High Protein Diet ◽  
Substrate Oxidation ◽  
High Protein ◽  
Nutrient Source ◽  
Oxidation Rates ◽  
High Protein Diets ◽  
Protein Diets ◽  
Plant Sources ◽  
Postprandial Energy Expenditure

Background: Changing nutrient source is one of the efforts to increase thermogenic effect (TEF) which may be significant for body weight reduction.Objective: The aim of this study was to investigate the effects of high protein diets using animal (chicken) and plant (tofu) sources on the thermogenic effect (TEF) and substrate oxidation.Method: Ten female adults (mean age 20.8+1.2 y) participated in two isocaloric diet ingestions. Each meal provided 30% of the daily basal energy need (32/26/42% as protein/fat/carbohydrates, respectively). Postprandial energy expenditure was measured by indirect calorimetry.Results: There were no significant differences in TEF and substrate oxidation. The postprandial fat oxidation rate was higher than that at the preprandial state, while carbohydrate and protein oxidation rates were lower.Conclusion: No differences were observed in TEF and substrate oxidation in animal- and plant-based diets. A high protein diet could be beneficial for weight loss, but animal protein does not appear to offer superior benefits compared to plant protein.

scholarly journals High-Protein Diets for Treatment of Type 2 Diabetes Mellitus: A Systematic Review

2019 ◽  
Vol 10 (4) ◽  
pp. 621-633 ◽  
Author(s):  
Samar Malaeb ◽  
Caitlin Bakker ◽  
Lisa S Chow ◽  
Anne E Bantle
Keyword(s):  
Diabetes Mellitus ◽  
High Protein Diet ◽  
High Protein ◽  
Protein Diet ◽  
Controlled Trials ◽  
Randomized Controlled ◽  
Glycemic Outcomes ◽  
High Protein Diets ◽  
Protein Diets

ABSTRACT Diet has the potential to be a powerful and cost-effective tool for treatment of type 2 diabetes mellitus (T2D). High-protein diets have shown promise for this purpose. The objective of this systematic review was to evaluate whether high-protein diets improve glycemic outcomes in people with T2D. We conducted a systematic search of literature published prior to 1 February 2018 to find clinical studies of high-protein diet patterns for treatment of T2D in human participants. A high-protein diet was defined as a diet with protein content greater than that of a typical diet in the United States (>16% of total energy as protein). Studies were excluded if weight loss >5% occurred or if no glycemic outcomes were measured. A total of 21 independent articles met our criteria and were included. Most tested diets had a protein content of around 30% of total energy. Many studies supported the use of high-protein diets for patients with T2D, but were limited by small size (n = 8–32) and short duration (1–24 wk). Randomized controlled trials tended to be larger (n = 12–419) and longer (6 wk–2 y), and had mixed results, with many trials showing no difference between a high-protein diet and control. Many randomized controlled trials were limited by low compliance and high dropout rates >15%. There were no consistent beneficial or detrimental effects of high-protein diets on renal or cardiovascular outcomes. Evidence was insufficient to recommend 1 type of protein (plant or animal) over the other. Our review suggests that interventions to improve compliance with diet change over the long term may be equally important as specific macronutrient recommendations for treatment of T2D.

INFLUENCE OF PRIOR DIETARY PROTEIN LEVELS ON RESISTANCE TO THE STRESS OF PROTEIN DEPLETION

PEDIATRICS ◽  
1962 ◽  
Vol 29 (1) ◽  
pp. 90-96
Author(s):  
Oliver W. Vaughan ◽  
L. J. Filer ◽  
Helen Churella
Keyword(s):  
Plasma Protein ◽  
Protein Turnover ◽  
High Protein Diet ◽  
High Protein ◽  
Intravenous Injections ◽  
Protein Levels ◽  
Low Protein ◽  
Protein Group ◽  
High Protein Diets ◽  
Protein Diets

One-day-old piglets were fed diets of either 50% or 14% protein for 8 weeks; they were given intravenous injections with S35-methionine-labeled plasma protein and were given a nonprotein diet. The plasma protein turnover and the nitrogen excreted were estimated by measuring the S35 activity and the nitrogen in aliquots of blood, urine and feces. During a 102-day period of protein privation, the animals that had received the high-protein diet lost little weight, while pigs previously fed a low level of protein lost 4.4 kg. However the high-protein group had a considerably faster rate of plasma protein turnover, catabolized a much large quantity of protein, and excreted more S35 and nitrogen than did the low-protein group. It is concluded that high-protein diets may make pigs less well able to cope with the stress of sudden protein deprivation.

Sign in / Sign up

Export Citation Format

Share Document