Intermittent Fasting Knowledge Center

Fasting and Drugs: Should You Fast While on Medication?

Upton Sinclair's 1911 fasting philosophy clashed with the medical establishment of his day. Here's what that historical tension teaches about fasting on medication.

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What Mainstream Medicine Now Says About Intermittent Fasting

In 1911 doctors called fasting dangerous quackery. Here's how mainstream medicine's position has shifted, and what modern guidelines actually recommend today.

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Why Fasting Fell Out of Fashion (And Why It's Coming Back)

Fasting was a popular home remedy in 1911, then vanished from mainstream medicine for decades. Discover why it disappeared and why science is reviving it today.

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Fasting as Preventive Medicine: The Case for Periodic Digestive Rest

Discover why Upton Sinclair's 1911 book The Fasting Cure argued for fasting as preventive medicine, not just a cure — and what modern science now confirms.

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The $500 Medicine Bill vs. the Free Fast: Sinclair's Challenge to Modern Healthcare

In 1911, Upton Sinclair argued fasting cost thirty cents where medicine cost $500. A look at his challenge to healthcare economics — and what's changed since.

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What Doctors Thought About Fasting in 1911 vs. What They Think Now

In 1911 doctors called fasting quackery. Discover how Upton Sinclair's The Fasting Cure was received then — and how modern medicine views fasting today.

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Why Fasting Is Free and That's the Problem

Upton Sinclair argued in 1911 that fasting's biggest obstacle wasn't safety — it was that it cost nothing. Here's his case, and what changed since.

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