Fasting Mimicking Diet (FMD)

Definition

An eating plan designed to mimic the effects of prolonged fasting while allowing a highly reduced caloric intake (usually 25% of normal needs). It combines specific foods for 5 days to trigger metabolic adaptations similar to fasting.

How it works

FMD is based on research showing that certain restrictive diets can activate cellular autophagy and renewal mechanisms, similar to complete fasting. For 5 consecutive days, calories are reduced to approximately 750-1100 calories with a specific nutritional composition in complex carbohydrates, protein, and healthy fats. This protocol allows the body to benefit from the regenerative effects of prolonged fasting, including improved insulin sensitivity and reduced systemic inflammation. Preferred foods include vegetable-based soups, flaxseeds, olive oil, and unsweetened dried fruits. This diet is generally practiced 1-4 times a year, depending on health goals.

Role

Triggers cellular autophagy and fasting-related metabolic adaptations while maintaining minimal nutritional intake.

Examples

• Vegetable soup and broth
• Flaxseeds and olive oil
• Unsweetened dried fruits
• Olive oil
• Herbal teas and water

Recommendations

Consult a healthcare professional before starting an FMD, particularly if you have medical conditions. Schedule your FMD during a calm period of your week to minimize stress and physical demands. Reintroduce normal calories gradually after the 5-day period to avoid reactive overfeeding.

Key takeaway

FMD provides the regenerative benefits of fasting with a less extreme and more practical approach for most individuals.

Related terms