Fasting vs. Eating Less: What's the Difference? (Science of Fasting)

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Published 2017-06-21
This is about the drastic physiological differences between fasting and eating less

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NOTE One of the key things in being able to fast in a healthy matter is entering the state of ketosis - that is, switching your metabolism from burning carbohydrate to burning fat. Considering most people have been burning carbohydrate their whole lives this can make fasting a challenge. Upton Sinclair recommends doing quite long fasts - 12 days, but you may want to work your way up to longer fasts. Unless you are relatively keto adapted (or have experience with fasting of course), it's important that you take precautions while doing a fast. Fasting isn't inherently dangerous, but diving into fasting when your body is in no way geared for it can be. I recommend doing more research before doing longer fasts. "The Complete Guide to Fasting" (amzn.to/2tQjxXa) is a good book to start with.
As Tim Ferriss puts it: Please don't do anything stupid and kill yourself. It would make us both quite unhappy.

Just in case I should also say that of course you need to balance fasting with eating - You need to survive off of something. I have been doing intermittent fasting the past year (22 hours fasted, 2 hours eating - you can widen it to 16/8, which still provides great benefits) and will fast for a couple days every other month or so. Several other people have recommend a routine like this - Tim Ferriss recommends doing a 3 day fast once per month and a 7 day fast once per year.
Also make sure you're getting enough fat, protein, micronutrients and fiber to maintain a healthy weight and healthy body - excessive fasting can be very dangerous.

Books Mentioned:
"The Obesity Code" by Dr. Jason Fung - amzn.to/2rXtalh
"The Fasting Cure" by Upton Sinclair - (If you google the title you can find the full book online)
"Tools of Titans" by Tim Ferriss - amzn.to/2rX6P7E


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All Comments (21)
  • @WhatIveLearned
    Just in case I should also say that of course you need to balance fasting with eating - You need to survive off of something. I have been doing intermittent fasting the past year (22 hours fasted, 2 hours eating - you can widen it to 16/8, which still provides great benefits) and will fast for a couple days every other month or so. Several other people have recommend a routine like this - Tim Ferriss recommends doing a 3 day fast once per month and a 7 day fast once per year.
  • I definitely have noticed that when I don’t eat, hunger goes away, but when I did eat small things throughout the day it would stimulate my hunger
  • @diwu4148
    Eat nothing is easier for me than eat less.
  • @Pauliesha
    I think we can all agree that we have more self discipline while fasting than eating a small amount🤷🏼‍♀️
  • @marymenatti9175
    Since my diagnosis (diabetes) I have begun to fast from 4pm to 7am. It’s easier if you think of it as “giving your digestive system a rest”. You’ve not denying yourself something. You’re pampering yourself.
  • Fasting works because our bodies were made to survive famines, not to constantly eat large quantities of food throughout the day.
  • @Batemann1980
    Fasting has made me realise how much time I used to spend eating.
  • @kh884488
    I've been doing OMAD for months now with a few extended fasts. For me, the hardest thing about intermittent fasting is needing to constantly reassure my wife that I won't starve myself to death.
  • @joutuber4714
    if you gonna fast for weight loss... think this when you get hungry... dont think im hungry think ahh now my body is starting to use my bodyfat as fuel/energy its a annoying proces but eventually its worth it
  • @BobRecordsTV
    I have been fasting for 12 minutes since I watched this video.
  • For me it's easier to avoid eating something than eating just a small amount of it. I can't control myself enough yet to eat only one cookie, if I start eating cookies, I have to eat at least six or seven of them, for example. That said, I prefer not to eat at all.
  • I just lost my job due to this pandemic and eating nothing does make a lot of sense.
  • First day of fasting as an Indian kid.... My house is in flames... Dad is threatening to throw me out of the house... Mom started to cry
  • @vanshikha7179
    Because I'm living alone, I almost never have breakfast and it's so damn hard to explain it to anyone, that I just don't feel hungry in the morning anymore, this video is the answer
  • How to fast for hours and not even be very hungry for days: Become a gamer with no one interrupting you
  • @Antonio_Ortiz
    I've literally watched this video at least a half a dozen times over the past 3 years, since the very beginning of my health-consciousness. It's been incredibly helpful in opening my eyes to the nature of eating, over-eating and the benefits of fasting. Thank you.
  • I once fasted for 15 days and you know what happened. Nothing. I was amazed. I drank water with a little bit of lemon in it the whole time. I was hungry the first day but that passed. After the 3rd day I started getting a little lightheaded. But that passed before the end of the 4th day. By day 5 I felt great. This lasted another 10 days to day 15. I never got hungry after the first day. By this time I told my girlfriend that if I continued to do it I would just be doing it for the sake of doing it. So I started eating again. One of the things I learned in that experience is that we've been lied to about nutrition just like many other things. The body performs better on a lack of food than it does on an excess amount of food. The food industry would lose Billions if people realized this and stop eating so much. I also find it somewhat comforting to be aware that I can go for weeks without eating and be fine. Some people think if they don't eat for a day or 2 they will drop dead on the spot.
  • @leahrohde3388
    People with eating disorders watching the experiment part: nervous laughter
  • @johnlevin4567
    “Growth hormone levels are increased when fasting” Me who wants to be tall: Well time to fast