399. He Ate Only Sardines for 5 Days. Then We Tested His Blood

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Robert Sikes put the viral sardine fast to a controlled test: five days of eating approximately 18 cans of sardines per day while maintaining roughly 3,000 calories. In this interview, Judy Cho and Robert examine what happened to his weight, blood glucose, ketones, energy, inflammation, hunger, and overall performance—and why his experience differed from the dramatic weight-loss results commonly shared across the keto and carnivore communities.

They also review Robert’s bloodwork before, immediately after, and several weeks after the sardine challenge, including arsenic, mercury, lead, cholesterol, thyroid markers, and SHBG. The conversation explores whether sardine fasting produces unique metabolic benefits, what may actually drive the rapid changes people report, and how extreme short-term diets can affect metabolic health, binge-restriction patterns, and long-term weight-loss success.

We discuss the following: 

• Sardine challenge preview
• Why Robert tested sardine fasting
• Eating 18 sardine cans daily
• Glucose rose while ketones dropped
• Why people do sardine fast
• Restriction, bingeing, and quick fixes
• Heavy metals after sardine challenge
• The appeal of extreme fasting 
• Should people fear mercury in sardines? 

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EPISODE RESOURCES

• Keto Savage Website
• Keto Savage Youtube
• Ketogenic Bodybuilding
• Savage Perspective Podcast
• Keto Brick

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*DISCLAIMER: This content is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. It should not replace professional medical advice.

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