> And I lose 3 lbs per day of fasting which in a sense is a
>measure of my metabolic rate. I am sure others
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>compromised due to fatigue and this overwhelming
>thoughts of food.
The apparent high weight loss in the first few days of fasting is
due mainly to loss of water, intestinal contents, and glycogen.
A total fast for more than a few days will induce ketosis, since
fat isn't catabolized effectively in the absence of carbohydrate,
so once you use up the glycogen, you'll consume it faster and
feel sicker and weaker due to the toxic ketones produced. But
you're not going to lose any 3 lbs per day unless you can also do
enough physical exercise to burn 6-10,000 calories.
Another problem with fasting more than a few days in a row is that
your body will start to consume protein, which will load your
kidneys, make you feel sicker, and can cause significant damage to
the heart and other organs.
Various crash diets consisting of only meats and fats take advantage
of the inefficient fat catabolism for greater fat loss and try to
minimize loss of body proteins. You still get the unpleasant and
unhealthy effects of ketosis -- nausea, bad breath, weakness,
malaise, extra load on the kidneys, etc. Ketosis is something
like solvent sniffing -- your body produces acetone and related
ketones. These things are neurotoxic, too, another reason ketosis
makes you feel weak and generally bad.
>Now I wonder if the accuracy of 3 lbs per day of fasting is in some
>agreement with known biological parameters.
No, it isn't, as you'll discover if you fast more than a few days.
>At what weight would a person, say die? Is it about 50 lbs? And if so,
>then a 3 lbs per day of loss in fasting would
>mean that 90/3 is 30 days of no food and I would likely die. So I
>wonder if that is relatively accurate, that a
>person would die around 30 days without food if starting at 139 lbs.
Depends on a lot of factors. Some people are grossly obese at 139 pounds,
while others are on the verge of emaciation. But you don't lose 3 lbs
per day unless you consume nothing, in which case you'll die quickly
from dehydration.
People sometimes undertake 40 day fasts for religious or spiritual
reasons, and this is usually survivable. IIRC, they usually lose
30-50 pounds. There are also 'juice fasts' in which the person
consumes small amounts of fruit juice, to avoid ketosis.
There are also any number of medically supervised fasting regimes for
fast weight loss in the extremely obese. It shouldn't take you much
effort to learn about them at PubMed.
Note that as in your own experience, weight lost by fasting is
seldom kept off. For one thing, once you start eating again, you
get back all that glycogen and intestinal contents. Also, as in
your experience, weight lost by these crash dieting methods is
usually regained within a year.
>Now I think there is another method of dieting that science has not
>looked into and for obvious good reasons. When
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>be a cold virus that is not harmful, but
>makes a person sick enough that they have no appetite for food.
Most colds last 7-10 days and I find it hard to believe that anybody
loses 20-30 lbs even with a really bad cold. (Reality check, eh?)
Note that your metabolic rate goes up about 7% for each Celsius
degree of fever, so a good, high, miserable fever can help you lose
weight. Wow, what a win!