In overweight women eating fewer calories, increasing daily protein intake from 48 grams to 124 grams does not change how much fat and carbohydrate-rich food they eat later, even though they report feeling fuller and having fewer food cravings.
See the scientific wording
In overweight women on an energy-restricted diet, replacing 48 g of daily protein with 124 g of protein does not significantly alter subsequent ad libitum intake of fat- and carbohydrate-rich foods, despite marked improvements in subjective satiety and cravings.
Very strong evidence
Randomized trialsOne good-quality study supports this claim.
What the research says
1 study reviewedSupporting (1)
Randomized Controlled TrialHuman2017
Even though women felt less hungry and craved food less when they ate more protein, they still ate the same amount of cookies, chips, and other tasty foods when they could eat as much as they wanted. So feeling fuller didn’t make them eat less of the junk food.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
Scores reflect study quality, not just count.
Eating more protein makes the stomach and brain feel full faster and reduces the urge to eat sweets or snacks, but it does not change how much the brain wants to eat tasty, high-fat, or high-sugar foods when they are available.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
How Fit Body Science checks a claim
- 1
We isolate the claim
Health advice from videos, articles and studies is broken down into single, testable claims.
- 2
We find the research
Each claim is matched against peer-reviewed studies, with every source cited by DOI.
- 3
We grade the evidence
Studies are scored on methodology, statistical rigor, transparency and publication quality.
The fitness and health internet is full of confident claims. We check them against real research.
Every claim on this site is traced back to peer-reviewed studies, scored on methodology and reporting quality, and given a verdict you can audit yourself — sources, DOIs and all.
- Full evidence breakdown and mechanism chains
- Ask our AI anything about a claim or its studies
- Get notified when new research changes a verdict
In overweight women eating fewer calories, increasing daily protein intake from 48 grams to 124 grams does not change how much fat and carbohydrate-rich food they eat later, even though they report feeling fuller and having fewer food cravings.
Mechanism
1 studyMore protein makes you feel less hungry and less like eating sweets, but it doesn't turn off your brain's desire for tasty, fatty, or sugary foods when they're right in front of you. Your stomach tells your brain you're full, but your brain still wants the cookies.
Eating more protein makes the stomach and brain feel full faster and reduces the urge to eat sweets or snacks, but it does not change how much the brain wants to eat tasty, high-fat, or high-sugar foods when they are available.
Elevated protein intake increases circulating amino acid concentrations, which stimulate gut hormone release including glucagon-like peptide-1 and cholecystokinin, enhancing vagal afferent signaling to the brainstem.
Increased vagal afferent input elevates activity in the hypothalamic satiety centers, reducing perceived hunger and suppressing cravings for energy-dense foods.
Neural reward pathways in the mesolimbic system remain responsive to palatable fats and carbohydrates, maintaining motivation to consume these foods regardless of satiety signals.
Evidence from Studies
Supporting (1)
Community contributions welcome
Even though women felt less hungry and craved food less when they ate more protein, they still ate the same amount of cookies, chips, and other tasty foods when they could eat as much as they wanted. So feeling fuller didn’t make them eat less of the junk food.
Contradicting (0)
Community contributions welcome
Score Breakdown
No multi-axis breakdown available yet. The overall Pro / Against score above is the best signal.
- No clinical evidence is available; the score reflects mechanistic plausibility only.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Systematic Review of High-Protein Diets vs. Moderate-Protein Diets on Ad Libitum Food Intake in Overweight Women on Energy Restriction
Population: Overweight women on energy-restricted diets; Intervention: 124 g daily protein; Comparator: 48 g daily protein; Outcome: Ad libitum intake of fat- and carbohydrate-rich foods; Duration: Minimum 4 weeks per arm across included studies.
Double-Blind Randomized Trial of 124 g vs. 48 g Daily Protein on Ad Libitum Food Intake in Overweight Women on Energy Restriction
Population: Overweight women on a controlled energy-restricted diet; Intervention: 124 g protein/day; Comparator: 48 g protein/day; Outcome: Ad libitum intake of fat- and carbohydrate-rich foods measured over 7 days after intervention; Duration: Minimum 4 weeks of intervention with 7-day ad libitum assessment period.
Prospective Cohort Study of Protein Intake and Subsequent Food Selection in Overweight Women on Energy Restriction
Population: Overweight women initiating energy-restricted diets; Exposure: Natural variation in protein intake (48 g vs. 124 g); Outcome: Ad libitum intake of fat- and carbohydrate-rich foods measured prospectively; Duration: Minimum 8 weeks of follow-up.
Cross-Sectional Analysis of Protein Intake and Ad Libitum Food Intake in Overweight Women on Energy Restriction
Population: Overweight women currently on energy-restricted diets; Exposure: Self-reported protein intake (48 g vs. 124 g); Outcome: Simultaneous measurement of ad libitum intake of fat- and carbohydrate-rich foods; Duration: Single time point assessment.
Case Report of Protein Intake Change from 48 g to 124 g and Subsequent Food Intake in a Single Overweight Woman on Energy Restriction
Population: One overweight woman on an energy-restricted diet; Intervention: Increase in protein from 48 g to 124 g/day; Outcome: Daily ad libitum intake of fat- and carbohydrate-rich foods recorded; Duration: 2–4 weeks post-intervention.