The Claim

In male C57BL/6 mice subjected to 40% calorie restriction, hypothalamic expression of Per1, Per2, and Cry1 is upregulated, negatively correlated with circulating leptin, insulin, and IGF-1 levels, positively correlated with food anticipatory activity, and negatively correlated with body temperature.

Source: The effects of graded levels of calorie restriction: VI. Impact of short-term graded calorie restriction on transcriptomic responses of the hypothalamic hunger and circadian signaling pathways

What the research says

Supports is higher

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

Supports
19score
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

In male C57BL/6 mice on a 40% calorie-restricted diet, the activity of three circadian genes in the hypothalamus increases, and this increase is consistently linked to lower levels of leptin, insulin, and IGF-1, higher food anticipatory activity, and lower body temperature.

See the scientific wording

In male C57BL/6 mice under 40% calorie restriction, hypothalamic expression of core circadian genes Per1, Per2, and Cry1 is upregulated and negatively correlated with circulating leptin, insulin, and IGF-1, and these same genes are positively correlated with food anticipatory activity and negatively correlated with body temperature, suggesting a coordinated hypothalamic response linking metabolic signaling, circadian regulation, and energy-conserving behaviors.

Why this might work

When food intake drops sharply, fat and liver signals that tell the brain to slow down drop too. This removes the brake on clock genes in the brain, making them more active. These genes then shift the body’s internal timing to prepare for food, increasing hunger-driven behavior before meals and lowering body temperature to save energy.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: The effects of graded levels of calorie restriction: VI. Impact of short-term graded calorie restriction on transcriptomic responses of the hypothalamic hunger and circadian signaling pathways

    When mice eat 40% less food, their brain’s internal clock genes become more active, and this matches with lower hormone levels, more eating behavior before meals, and cooler body temperature — showing these genes help the body save energy.

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

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