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5:2 Diet

The Fast Diet, Intermittent Fasting (5:2)

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Meta Information

ID:five-two-diet
Name:5:2 Diet
Schema Version:1.5

Title

5:2 Diet

Alternate Names

  • The Fast Diet
  • Intermittent Fasting (5:2)

Intervention Type

dietary_practice

Expected Cost Mean

Low Cost:
0
High Cost:
0
Cost Type:
monthly
Description:
No direct cost; may result in grocery savings on fasting days.

Summary

The 5:2 diet is a form of intermittent fasting involving severe calorie restriction for two non-consecutive days per week. This periodic energy deficit is believed to activate key cellular repair and stress resistance pathways, such as autophagy and NRF2. By improving insulin sensitivity and reducing inflammation, this approach aims to enhance metabolic flexibility and combat drivers of age-related disease.

Purpose

A form of intermittent fasting to improve metabolic health.

Card Summary

A popular intermittent fasting method involving two low-calorie days per week to activate cellular repair and improve metabolic flexibility.

Drug Class

Drugs In Class

Empty Array

Impact

Score:
7
Justification:
Strongly influences key metabolic pathways like insulin sensitivity and autophagy.

Evidence

Grade:
B
Score:
6.5
Justification:
Human trials show metabolic benefits; long-term healthspan data is still emerging.

Safety

Score:
1.5
Justification:
Generally safe for healthy adults but may be inappropriate for certain populations.

Flags

  • Not recommended for individuals with a history of eating disorders.
  • Consult a physician if you are pregnant, breastfeeding, or have diabetes.
  • May cause temporary side effects like fatigue, irritability, or headaches on fasting days.
  • Long-term adherence can be a significant challenge for some individuals.

Verdict

A practical entry point to fasting's metabolic benefits.

Created

2026-04-23T23:33:06.610595Z

Model

Gemini 3.1 Pro (High)

Delivery

Route:
none
Scope:
  • systemic

Indication

Focus:
healthspan
Description:
The 5:2 diet is a form of intermittent fasting involving severe calorie restriction for two non-consecutive days per week. This periodic energy deficit is believed to activate key cellular repair and ...

Typical Protocol

  • Eat a normal, healthy diet for five days of the week.
  • Restrict calorie intake to approximately 500-600 calories on two non-consecutive days.