The Claim

Prolonged calorie restriction causes organ shrinkage, which in turn contributes to a reduction in metabolic rate.

What the research says

Supports is higher

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

Supports

16score

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.

How it works

1 study reviewed

In plain English

When people eat way fewer calories for a long time, their organs can get smaller, and that makes their body burn fewer calories overall.

See the scientific wording

Prolonged calorie restriction can cause organ shrinkage, which contributes to a slowdown in metabolic rate.

1 study

Study: Long-term calorie restriction decreases metabolic cost of movement and prevents decrease of physical activity during aging in the rhesus monkeys
This study found that monkeys eating fewer calories for many years burned less energy at rest, even though they stayed more active. This suggests their bodies became more efficient, which could mean their organs got smaller or worked differently — just like the claim says.

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.