Fasting for a week:

• Causes significant changes in protein levels across various organs.
• May have health benefits beyond weight loss, but only after 3 days.
• Switches energy source from glucose to fat after 2-3 days.
• Average weight loss of 5.7 kg (fat and muscle), with most fat loss sustained after 3 days of eating.

Implications:

• Provides insights into the molecular basis of fasting's health effects.
• Paves the way for developing alternative treatments based on fasting benefits.
• Confirms historical use of fasting for specific health conditions.