Blog: 30+ days of water fasting journey
by fastingforchange

Ketosis and fasting

Taking a look at ketosis

Date:   4/2/2011 5:26:17 PM   ( 11 y ) ... viewed 18705 times

I am starting a fast tomorrow, so I am blogging some of the things that I found important to me. By blogging information about fasting it keeps me on track and reminds me of all the changes that my body will go through.

What is Ketosis?

Ketosis is a condition in which levels of ketones (ketone bodies) in the blood are elevated. Ketones are formed when glycogen stores in the liver have run out. The ketones are used for energy. Ketones are small carbon fragments that are the fuel created by the breakdown of fat stores

when the body is in ketosis the individual tends to feel less hungry, and will probably eat less than he/she might otherwise do. The body switches from being a carbohydrate-burning organism into a fat-burning one. The fat stores become a primary energy source, and the person loses weight. That is why low-carb diets have become popular, and effective, especially among obese people.


What happens when you are fasting?

The most important changes that happen to the body during a fast takes place in the first three days. These occur as the body switches from one fuel source to another. Normally, the primary form of energy the body uses for energy is glucose, a type of sugar. Most of this is extracted or converted from the food we eat.

Throughout the day, the liver stores excess sugar in a special form called glycogen that it can call on as energy levels fall between meals. There is enough of this sugar source for 8-12 hours of energy and usually, it is completely exhausted within the first 24 hours of fasting. (However, once the body shifts over to ketosis or fat as fuel, this new fuel is used to also restore the body's glycogen reserves.)
Once the liver's stores of glycogen are gone, the body begins to shift over to what is called ketosis or ketone production - the use of fatty acids as fuel instead of glucose. This shift generally begins on the second day of fasting and completed by the third. In this interim period there is no glucose available and energy from fat conversion is insufficient but the body still needs fuel. So it accesses glucose from two sources. It first converts glycerol, available in the body's fat stores, to glucose but this is still insufficient. So it makes the rest that it needs from catabolizing, or breaking down, the amino acids in muscle tissue, using them in the liver for gluconeogenesis, or the making of glucose. Between 60 and 84 grams of protein are used on this second day, 2-3 ounces of muscle tissue. By the third day ketone production is sufficient to provide nearly all the energy the body needs and the body's protein begins to be strongly conserved. The body still needs a tiny amount of glucose for some functions, however, so a very small amount of protein, 18-24 grams, is still catabolized to supply it - from 1/2 to 1 ounce of muscle tissue per day. Over a 30 day water fast a person generally loses a maximum of 1-2 pounds of muscle mass. This conservation of the body's protein is an evolutionary development that exists to protect muscle tissue and vital organs from damage during periods of insufficient food availability.

From the third day onward the rate of the breakdown of fatty acids from adipose or fat tissue continues to increase, hitting its peak on the tenth day. This seven day period, after the body has shifted completely over to ketosis, is where the maximum breakdown of fat tissue occurs.

As part of protein conservation, the body also begins seeking out all non-body-protein sources of fuel: nonessential cellular masses such as fibroid tumors and degenerative tissues, bacteria, viruses, or any other compounds in the body that can be used for fuel. This is part of the reason that fasting produces the kind of health effects it does.

Also, during this period of heightened ketosis the body is in a similar state as the one that occurs during sleep - a rest and detoxification cycle. It begins to focus on the removal of toxins from the body and the healing and regeneration of damaged tissues and organs.



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Comments (7 of 7):
Re: Fasting & Weig… claud… 9 y
Re: Fasting & Weig… linda… 9 y
Re: Day 4 #113835 11 y
Re: Fasting & Weig… MaryF… 11 y
Re: Fasting & Weig… lovel… 11 y
Re: Fasting & Weig… fasti… 11 y
Re: Fasting & Weig… spt 11 y
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