@ TotheAnkles....
I must say thank you for your politeness of differing opinions. Let me guess you think medicine is good for us to? Western medicine, sport science ( which your response is based off of) etc do not validate Eastern things. Yes fasting is a caloric deficit, the point is to purge the body. Fad diets are bad for your heart not because of the fasting but the binging done afterwards. The heart is a different muscle when in caloric deficit the body eats at fatty muscle first, then the fat. There is nothing wrong with ketosis. If you read medical journals you would see that it is the rise in Non_Alcoholic Fatty Liver that has scientist concerned. But like Marijuana, they look at one side. Fasting, not the processed foods, and high fat and sodium diet. Which are all linked to NAFL and other auto immune diseases.
I let my wife, a who has her masters in CNS, read this, called my Physicians Assistant friend. two doctor friends, and a friend in med school. Fasting is not as bad as you think Most people fight cancer better with weeks of fasting, juice fasting and clean eating than chemo( which is a poison)
Your body can go a long time without food, it doesn't matter how full you are it matters how much fat is there. That is what is is there for. A 250lb 5' 6" male can last longer than a 135 5 '6" male with out damaging his body, in fact his body would benefit.
Toxin, define toxin. Mercury, yeah different story. However junk piled up from processed foods etc. all have an effect.
Fasting can help rid food addictions, lower high blood pressure, high cholesterol, restore liver function, kidney function, lower triglycerides, to name a few things.
I speak from personal experience. After back and knee surgery weight gain etc, I was at high risk for diabetes and heart attack. After consulting many doctors who have both eastern and western ideologies and Japanese doctors, I started fasting. Three years following American belief I needed to be medicated, Following fasting in 12 months all my levels are perfect and within range of a healthy person.
So while you are partly correct you might want to look into medical claims before you make them. Medical Journals actually support fasting for limited times, but then again Western Medicine stays away from cures, they like to stick within the legal limits set by the FDA to treat disease but not cure. But all that doesn't matter because we will believe what we all want to believe but I kindly ask that you be kind, I am amazed how the curtness of dreads, who, having facing such .... I will leave it alone.