Saturday, August 8, 2026

The Sardine & Egg 72-Hour Challenge

The 72-hour Sardine Fast was invented by Dr Annette Bosworth.

 Sardine fasting was invented by Dr. Annette Bosworth, aka Dr. Boz, who specializes in reversing medical problems through healthy ketogenic living. She first implemented sardine fasting when she was traveling with her family and wanted to find an easier way to stick to a keto lifestyle. During this fast, you can only consume sardines, water, and black tea or coffee. There is also no eating routine or window, a person can eat whenever they are hungry.  Sardines are highly nutritious. They are high in omega-3 vitamin D, free vitamin E, calcium, selenium, and many other minerals and enzymes. The high protein and fat content within them often makes you feel fuller.    https://www.newsweek.com/3-day-sardine-fast-keto-diet-impressive-results-1817004

Only buy Sardines in olive oil, not soybean oil.  The ones in water have a stronger taste and different texture, and you need to add fat to them anyways, so just get the ones in olive oil.

The egg fast was invented by a blogger.  It involves eating only eggs, butter and cheese.  It is a strict, short-term ketogenic diet plan used to break weight-loss plateaus.  Eggs are cheap and very filling.

A Sardine & Egg Fast just combines the two.  The main reason for not doing a strict sardine fast is that they are very expensive, about $4 per 4-oz tin.

I am going to start this soon and will document my results.  I bought 5 tins of sardines and I have about 2 dozen eggs and 2 sticks of Kerrygold butter.



Rules of the Sardine 2.0 Challenge
1. The clock starts when you open can #1.  Unlike a water fast where you eat a meal and start the timer, this timer starts when you eat the first bite of sardines. The timer stops just after you eat the final can.
2. Eat at least 1 can every 24 hours and ideally eat when you are hungry.  She recommends King Oscar brand.
3. Toppings include mustard, hot sauce and black pepper. No ketchup or any condiments with carbohydrates.  No crackers or bread, even keto bread.
4. If you cannot stomach sardines, you can substitute mackerel or herring (kipper).  But try sardines first.  And the same rules, only buy it if it is in olive oil.
5. If you are allergic to fish, then do the egg fast.


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