In the short term, meat and dairy make your body burn more calories after eating than plant proteins like beans or tofu, but after a while, both types work the same way.
Scientific Claim
Animal protein induces higher thermogenesis than vegetable protein in the short term, but this difference diminishes over the long term.
Original Statement
“On the short-term 'fast' proteins are more satiating than 'slow' proteins, and animal protein induces a higher thermogenesis than vegetable protein. In the longer term the higher postabsorptive satiety and thermogenesis are sustained irrespective of the protein source.”
Evidence Quality Assessment
Claim Status
overstated
Study Design Support
Design cannot support claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The abstract uses definitive language ('induces higher thermogenesis') without reporting original measurements or study designs. As a narrative review, only an association can be inferred.
More Accurate Statement
“Short-term thermogenesis appears to be higher after consumption of animal protein compared to vegetable protein, but this difference is not sustained over the long term, based on synthesis of prior studies.”
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Randomized Controlled TrialLevel 1bCausal difference in thermogenesis between animal and plant proteins under controlled conditions.
Causal difference in thermogenesis between animal and plant proteins under controlled conditions.
What This Would Prove
Causal difference in thermogenesis between animal and plant proteins under controlled conditions.
Ideal Study Design
A crossover RCT with 30 healthy adults consuming 30g of isolated animal protein (whey) vs. plant protein (soy) in random order, with indirect calorimetry measuring energy expenditure for 4 hours post-ingestion, under fasting and isocaloric conditions.
Limitation: Does not reflect real-world mixed meals or long-term adaptation.
Prospective Cohort StudyLevel 2bLong-term association between protein source and metabolic rate in free-living individuals.
Long-term association between protein source and metabolic rate in free-living individuals.
What This Would Prove
Long-term association between protein source and metabolic rate in free-living individuals.
Ideal Study Design
A 6-month prospective cohort of 200 adults consuming either predominantly animal or plant protein (≥60% of total protein), measuring 24-hour energy expenditure via doubly labeled water and body composition changes.
Limitation: Cannot isolate protein source effect from overall dietary patterns.
Cross-Sectional StudyLevel 3Correlation between habitual protein source and resting metabolic rate in a population.
Correlation between habitual protein source and resting metabolic rate in a population.
What This Would Prove
Correlation between habitual protein source and resting metabolic rate in a population.
Ideal Study Design
A cross-sectional analysis of 1,000 adults measuring dietary protein source (via food frequency questionnaire) and resting metabolic rate (via indirect calorimetry), adjusting for age, sex, BMI, and physical activity.
Limitation: Cannot determine direction of causality or temporal sequence.
Evidence from Studies
Supporting (1)
The significance of protein in food intake and body weight regulation
The study found that animal protein makes your body burn more calories right after eating than plant protein, but over time, both types of protein make your body burn about the same amount of calories — so the difference goes away.