The Claim

A diet composed of ultra-processed foods with slow eating rate textures does not significantly change body weight, fat mass, or fat-free mass over a 14-day period, even when energy intake is reduced.

Source: The Effect of Eating Rate of Ultra‐Processed Foods on Dietary Intake, Eating Behaviour, Body Composition and Metabolic Responses—Rationale, Design and Outcomes of the Restructure Randomised Controlled Trial

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
72score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Description
1 study reviewed
In plain English

Eating ultra-processed foods slowly for 14 days does not change body weight, fat mass, or muscle mass, even if people consume fewer calories.

See the scientific wording

Ultra-processed diets with slow eating rate textures do not significantly alter body weight, fat mass, or fat-free mass over a 14-day period despite reduced energy intake, indicating that short-term caloric reduction from eating rate changes may not translate to measurable body composition changes.

Why this might work

When people eat harder, chewier ultra-processed foods slowly, their mouth and throat send stronger fullness signals to the brain, and their gut releases more hormones that stop hunger. This makes them eat fewer calories. But in just two weeks, the body does not lose weight or fat because the calorie reduction is too small and the body holds onto its energy stores.

Supported mechanismbased on 1 study

What the research says

1 study
  1. Study: The Effect of Eating Rate of Ultra‐Processed Foods on Dietary Intake, Eating Behaviour, Body Composition and Metabolic Responses—Rationale, Design and Outcomes of the Restructure Randomised Controlled Trial

    When people ate ultra-processed foods more slowly, they consumed fewer calories—but their weight and body fat didn’t change in two weeks. This suggests that just eating slower for a short time isn’t enough to lose weight or change body composition.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.