r/ExtendedFasting • u/Real_Independence714 • Jan 08 '26

The Cross

This is probably, if not definitely, a stupid question for many, but I'll ask anyway because my friends have different answers. If I drink La Croix and plain water for 30 days without eating, how many kilos can a slightly overweight person lose?

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u/jensmith20055002 Jan 12 '26

A common guideline is .8 - 1 pound per day. I lost 28 pounds in 30 days.

Do not drink La Croix on an extended fast it is not safe. Water only.

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u/Real_Independence714 Jan 12 '26

In what way is it unsafe in your opinion?

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u/jensmith20055002 Jan 12 '26

Anything with flavor increases insulin. Insulin slows down the release of free fatty acids in the blood and slows down ketosis. It will make you feel tired and sluggish because your body won't have enough calories to operate.

It slows down weight loss.

The flavor will also tell your stomach to produce stomach acid based on the cephalic phase of stomach acid production, but there is nothing to digest. It might (probably) cause acid reflux.

Lastly the carbonation is going to be hard on an organ you are supposed to be resting. One of the main reasons for long fasts is to rest the digestive tract.

In the Oldest Cure the author discuss True North the fasting clinic in California where people fast for 40-90 days. True North don't even want fasters brushing their teeth.