Cited by 33Regulation of Appetite and ObesityDietary Effects on HealthAdipose Tissue and Metabolism

Low-protein diets with fixed carbohydrate content promote hyperphagia and sympathetically mediated increase in energy expenditure

Zapata, Rizaldy C., Singh, Arashdeep, Pezeshki, Adel, Avirineni, Bharath S., Patra, Souvik, Chelikani, Prasanth K.·2019·Molecular Nutrition & Food Research

Abstract

SCOPE: Dietary protein restriction elicits hyperphagia and increases energy expenditure; however, less is known of whether these responses are a consequence of increasing carbohydrate content. The effects of protein-diluted diets with fixed carbohydrate content on energy balance, hormones, and key markers of protein sensing and thermogenesis in tissues are determined. METHODS AND RESULTS: Obesity-prone rats (n = 13-16 per group) are randomized to diets containing fixed carbohydrate (52% calories) and varying protein concentrations: 15% (control), 10% (mild protein restriction), 5% (moderate protein restriction) or 1% (severe protein restriction) protein calories, or protein-matched to 5% protein, for 21 days. Propranolol and ondansetron are administered to interrogate the roles of sympathetic and serotonergic systems, respectively, in diet-induced changes in energy expenditure. It is found that mild-to-moderate protein restriction promotes transient hyperphagia, whereas severe protein restriction induces hypophagia, with alterations in meal patterns. Protein restriction enhances energy expenditure that is partly attenuated by propranolol, but not ondansetron. Moderate to severe protein restriction decreases gains in body weight, lean and fat mass, decreased postprandial glucose and leptin, but increased fibroblast growth factor-21 concentrations. Protein-matching retains lean mass suggesting that intake of dietary protein, but not calories, is important for preserving lean mass. Notably, protein restriction increases the protein and/or transcript abundance of key amino acid sensing molecules in liver and intestine (PERK, eIF2α, ATF2, CHOP, 4EBP1, FGF21), and upregulated thermogenic markers (β2AR, Klotho, HADH, UCP-1) in brown adipose tissue. CONCLUSION: Low-protein diets promote hyperphagia and sympathetically mediated increase in energy expenditure, prevent gains in tissue reserves, and concurrently upregulate hepatic and intestinal amino acid sensing intermediaries and thermogenic markers in brown adipose tissue.

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Crossref · 10.1002/mnfr.201900088

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Authors
Zapata, R. C., Singh, A., Pezeshki, A., Avirineni, B. S., Patra, S., & Chelikani, P. K.
Affiliations
  • University of Calgary (CA)
  • Oklahoma State University (US)
Corresponding author
Chelikani, Prasanth K.
Venue
Molecular Nutrition & Food Research
Publisher
Wiley
Published
2019-08-07
Volume
63
Issue
21
Pages
e1900088-e1900088
ISSN
  • 1613-4125 (ISSN-L)
  • 1613-4133
OpenAlex
W2966081695
Cited by
33
References
49
Citations by year
2026: 2 · 2025: 8 · 2024: 7 · 2023: 6 · 2022: 4 · 2021: 4 · 2020: 2
FWCI
1.38
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular Nutrition & Food Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Canada Foundation for Innovation
  • Ministry of Advanced Education, Government of Alberta
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Health Sciences › Medicine › Physiology › Dietary Effects on Health
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
low-protein diet, protein restriction, hyperphagia, energy expenditure, sympathetic nervous system, serotonergic system, obesity-prone rats, FGF21, amino acid sensing, PERK-eIF2α pathway, brown adipose tissue thermogenesis, leptin, postprandial blood glucose, lean body mass, body composition, propranolol, ondansetron
MeSH terms
Animals, Body Composition, Body Weight, Adipose Tissue, Brown, Energy Intake, Dietary Carbohydrates, Energy Metabolism, Fibroblast Growth Factors, Hyperphagia, Liver, Male, Rats, Sprague-Dawley, Diet, Protein-Restricted, Leptin, Thermogenesis

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