"Even just holding back on eating more food during meals is a fast."

No, you're not fasting if you break ketosis by eating carbs. To stay in ketosis you need to avoid carbs and you need a ketone meter to be certain what you're eating isn't knocking you out of ketosis because that's what fasting is.

"Fruit juices, preferably freshly squeezed or blended, diluted in 50 percent distilled water if the fruit is acid. Orange, apple, pear, grapefruit, papaya, grape, peach or other fruits are good."

Fruit juice eats the enamel off your teeth and it's an instant sugar spike... If you're diabetic or pre-diabetic (which most americans are) you're making your health worse by juicing.

That PDF is terrible. It's like it was written by someone that was educated 60+ years ago and then stopped learning anything new. Actually I may be spot on if the Dr. Bill Bright named in the document is this Bill Bright that also promoted the spiritual benefits of fasting. He was as much a doctor as Jill Biden is a doctor. Stop reading and sharing outdated shit by someone that was never a medical doctor. You'll never know why or how fasting works reading that.

Here's three actual Doctors you should follow.

Eric Berg

https://www.youtube.com/@DrEricBergDC/search?query=fasting

https://www.youtube.com/@DrEricBergDC/search?query=keto

Ford Brewer

https://www.youtube.com/@PrevMedHealth/search?query=fasting

https://www.youtube.com/@PrevMedHealth/search?query=keto

William Davis

https://www.youtube.com/user/wheatbelly (Also avoid wheat. It's like eating sugar and in some ways, worse.)