The Science in the Bible

Entry 47 · Section 5: Heal

Forty Days Without Food

Jesus fasts in the wilderness, while Moses separately remains with the Lord without bread or water on Sinai.

Scripture: Matt 4:2; Ex 34:28

PhysiologyNutrition

Fuel-use sequence during prolonged fasting: stored glycogen falls first, fat and ketone use rise, and protein continues to supply essential glucose and tissue turnover.
Fuel-use sequence during prolonged fasting: stored glycogen falls first, fat and ketone use rise, and protein continues to supply essential glucose and tissue turnover.

The question

How does the body shift fuels during a prolonged fast with water available?

Why it matters

The two 40-day accounts must remain distinct because absence of food and absence of both food and water are not the same physical case.

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