Eating ultra-processed foods with more protein and fewer carbs makes your body burn about 130 extra calories per day just to digest and process the food, even if you’re not moving more.
Scientific Claim
In healthy young adults, a short-term (54-hour) high-protein (30% energy), lower-carbohydrate (29% energy) ultra-processed diet increases total daily energy expenditure by 128 kcal compared to a normal-protein (13% energy), normal-carbohydrate (46% energy) ultra-processed diet, primarily due to elevated diet-induced thermogenesis from increased protein metabolism.
Original Statement
“The 24-h and sleep energy expenditure were both higher in HPLC-UPF compared with NPNC-UPF (+128 ± 98 kcal d−1; P < 0.001; Fig. 3a; +67 ± 90 kcal d−1; P < 0.01; Fig. 3b).”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
definitive
Can make definitive causal claims
Assessment Explanation
Direct measurement of energy expenditure via whole-room calorimetry in a randomized crossover design provides Level 1b evidence for causation. The effect size is precise and statistically significant.
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.
Systematic Review & Meta-AnalysisLevel 1aWhether the 128 kcal/day increase in energy expenditure from high-protein diets is reproducible across different populations and protein sources.
Whether the 128 kcal/day increase in energy expenditure from high-protein diets is reproducible across different populations and protein sources.
What This Would Prove
Whether the 128 kcal/day increase in energy expenditure from high-protein diets is reproducible across different populations and protein sources.
Ideal Study Design
A meta-analysis of 15+ RCTs using whole-room calorimetry to compare high-protein (≥25% energy) vs. normal-protein (≤15% energy) diets in healthy adults, measuring 24-h TEE, with subgroup analysis by protein source and baseline BMI.
Limitation: Cannot determine if the effect is sustained beyond short-term interventions.
Randomized Controlled TrialLevel 1bIn EvidenceWhether the thermogenic effect persists during weight loss or overfeeding.
Whether the thermogenic effect persists during weight loss or overfeeding.
What This Would Prove
Whether the thermogenic effect persists during weight loss or overfeeding.
Ideal Study Design
A double-blind RCT of 60 healthy adults randomized to 4 weeks of high-protein (30% energy) or normal-protein (13% energy) diets during 2 weeks of overfeeding and 2 weeks of weight maintenance, with TEE measured by calorimetry at each phase.
Limitation: Does not assess long-term metabolic adaptation or hormonal resistance.
Prospective Cohort StudyLevel 2bWhether higher habitual protein intake predicts higher resting metabolic rate over time.
Whether higher habitual protein intake predicts higher resting metabolic rate over time.
What This Would Prove
Whether higher habitual protein intake predicts higher resting metabolic rate over time.
Ideal Study Design
A 10-year prospective cohort of 3,000 adults measuring habitual protein intake via food diaries and resting metabolic rate via indirect calorimetry annually, adjusting for lean mass, age, and physical activity.
Limitation: Cannot prove causation due to confounding by body composition and lifestyle.
Evidence from Studies
Supporting (1)
Short-term effects of high-protein, lower-carbohydrate ultra-processed foods on human energy balance
This study gave people two different ultra-processed diets for just over two days — one with more protein and less carbs — and found they burned 128 more calories per day on the high-protein diet, exactly as the claim says.