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- Path: sparky!uunet!vtserf!creatures!csgrad.cs.vt.edu!brand
- From: brand@csgrad.cs.vt.edu (Jeff Brandenburg)
- Newsgroups: sci.med.nutrition
- Subject: Re: Weight gain puzzle
- Message-ID: <4073@creatures.cs.vt.edu>
- Date: 24 Jan 93 01:51:46 GMT
- References: <1993Jan18.195659.1@acfcluster.nyu.edu>
- Sender: usenet@creatures.cs.vt.edu
- Organization: VPI&SU Computer Science Department, Blacksburg, VA
- Lines: 27
-
- In article <1993Jan18.195659.1@acfcluster.nyu.edu> hochbrgz@acfcluster.nyu.edu writes:
- >1. A gram of fat contains about 9 calories
- >2. Eating about 3500 extra (non expended) calories results in a weight gain
- > of 1 pound.
- >
- >Suppose I eat 1 pound of fat. 1 kilogram ~= 2.2 lb, so 1 lb ~= 454.54 grams.
- >At 9 calories/gram, 1 pound of fat contain about 4090 calories.
- >If these are all excess calories, a weight gain of 4090/3500 = 1.17 pounds
- >should result.
- >
- >Where does the "extra" .17 pounds come from???
-
- Out of thin air. One "burns" food by combining it with oxygen from the air,
- although the specific reactions are, er, involved. When the products of
- these reactions are incorporated into your body, some of the oxygen stays
- with them. Thus, the added weight.
-
- From a simple, combustion-based point of view, fat contributes more calories
- per gram because it consists mostly of carbon and hydrogen; carbohydrates and
- proteins contain a higher percentage of oxygen and (in proteins) other things
- that do not serve as fuel. Energy differences based on the body's different
- response to "fat calories," "carbo calories," etc. are still a point of some
- contention.
-
- --
- -jeffB (Jeff Brandenburg, Va. Tech CS)
- not a biochemist
-