Everyone's body is different.

I can fast for many consecutive days with no issues. I've done it.

i'm losing weight without even trying. i eat the same as before and ride 6-8 hours a week. it's starting to be a problem, though. the fat is leaving my face!

Like calorie counting, it can provide a structure that helps some people succeed: [1] This is the time when I eat, and [2] This is the time when I do NOT eat.

It also can have health benefits: https://www.healthline.com/nutrition...ittent-fasting

This was debunked a decade ago. The human body is not a german oven, nor is it as simple as the Law of Thermodynmaics. Do some reading.

So the human body is a perpetual motion machine? Please, cite your sources.

If you get to the point where you are burning ketones, you are in a world of hurt. Your diabetes is either way, way out of control, or you are desperate enough to try that fat only diet because every anti-seizure medication has failed. Burning ketones is not healthy.

You only have to go about a day without eating for the ketone metabolism to start. I don't find fasting for several days to be painful at all. I do not have diabetes nor siezures of any kind.

Do a little reading, educate yourself. Books are your friend.

In other words, you have no sources. Understood.

Books??

How old school!

It's all about peer reviewed journal articles now.

Sometimes the old ways are the best.

Exactly my point. Some people need to eat almost constantly. some often, some less, some little .... Maybe you were borderline hypoglycemic. Maybe you had an unusual metabolism. I thought you had mentioned some health problems ( I am too lazy to look back.)

But yes. I Would assume your doctor knew what s/he knew what s/he was talking about.

I assume if I had cancer and you didn’t your doctor would make different diagnoses for each of us.

If you can't go 6 hours without food, I would suggest you may have some other sort of underlying medical issue at play here. Were that the case for most humans, our species would have never survived as hunter/gatherers.

Geoff is correct. Humans can't violate the law of thermodynamics.

if Your metabolism slows down isn't it also a good way to save $$$ ? As long as You east less calories than You need you should also lose weight and eat less food ($)

I forgot where I read it but I seem to recall a statistic that most people on this earth only eat once per day. This breakfast, snack, snack, lunch, snack, snack, dinner, snack, alcohol daily cycle is pure luxury for most people.

The problem is that you don't feel less hungry. In fact your hunger reflex gets stronger and you crave dense foods. Its a survival instinct, if denied adequate calories too long the brain triggers a lot of things to get calorie intake back up while reducing calorie outgo. You just have to spend a couple of weeks convincing your subconscious that food is actually readily available.

No one is violating anything. Your reasoning leads you to the truism "A calorie is a calorie".

Were life so simple...

In my experience, the feeling of hunger presents itself around the time that one would routinely eat. If you eat 5 times a day, and try to fast, you will probably get hungry and stay hungry almost constantly because your body is expecting food constantly. If you settle into a more sparse eating pattern like once a day, your body becomes accustomed to that and you don't get hungry until that time of day that you ordinarily eat.

You still haven't provided any citations to suggest that a calorie (actually kilocalorie, which is a scentific unit of energy measurement equivalent to 4184 Joules) of chocolate will in any way take more effort to burn than a calorie of, say, broccoli. While the energy densities of these foods are vastly different, if you're measuring by calorie and not volume, then you've already corrected for that factor.

Maybe skip the Power Bars... some of them things have more fat & calories than you think. And don't misjudge the amount of calories being burned while biking. It takes discipline and serious change in eating lifestyle habits to drop and sustain significant weight loss.

The perceived impact of biking on weight loss is far too optimistic. I basically do not take it into account at all and consider it a bonus on top of the already difficult task to limit calories intake every day.

I agree. I used to do what the common majority trumpeted - eat 3-5 times per day. It just did not work for me. I started by completely skipping breakfast, thinking that if I haven't done anything to burn the calories of the preceding evening I sure do not need to stuff my face first thing in the morning before I head out to my office job where I sit on my butt and work out on my tactile keyboard. Everyone around me were saying: "ooh you should not do this...breakfast is necessary to start the day"... At first my mind and body screamed for attention but over time my routine developed to be without food until around 11AM and feel no significant physical or emotional impact. That has been approximately 2 years ago and I'm doing great. Now I'm working on limiting the evening hours of calorie intake. :-)

Since a calorie is a unit of energy, "a calorie is a calorie" is entirely true.

In the real world, the calorie counts on various products are just estimates and it is true that your body may be slightly less efficient at processing/digesting some forms of caloric intake than with others but this overall effect is minor. There is no physical way for your body to not lose weight on 500 calories a day regardless of the source.

Science is anything but. If you believe something was accepted before, but now debunked, why do you assume what you now accept is true?

I see the poop flinging has started.