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Thread: metabolism

  1. #1 metabolism 
    Moderator Moderator AlexP's Avatar
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    Can people really have a faster or slower metabolism that affects how easy it is for them to gain or not gain weight? It seems like I heard about that a lot, but thinking about it, I don't really understand why a particular person's metabolism would be any faster or slower than that of anyone else. And then...the metabolism is all of the chemical reactions that take place in the body, not just the ones involved in processing the 'stuff' we take in with food. Some clarification from you smart people would be nice.


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  3. #2 Re: metabolism 
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    Quote Originally Posted by Chemboy
    Can people really have a faster or slower metabolism that affects how easy it is for them to gain or not gain weight? It seems like I heard about that a lot, but thinking about it, I don't really understand why a particular person's metabolism would be any faster or slower than that of anyone else. And then...the metabolism is all of the chemical reactions that take place in the body, not just the ones involved in processing the 'stuff' we take in with food. Some clarification from you smart people would be nice.
    Hello, Chemboy,

    Yes, metabolic rates can vary widely between individuals. The most obvious thing, of course, is the degree of physical activity.

    Beyond that, there are still many factors involved. Perhaps one of the easiest to understand is the body's usage of insulin. If not enough is produced or it isn't used effeciently, metabolism can drop considerably.


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  4. #3  
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    Usually younger adults have faster metabolism. So if young people get cancer the tumor grows much faster because of the better metabolism. is this true? Also the faster metabolism of younger people to seroconvert for HIV faster because their metabolism is faster. Is this true?

    however faster metabolism means better nutrition for cells including cancer cells so wouldnt it make cancer cells grow faster and other body activity to speed up than older people with slower metabolism
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  5. #4  
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    Hello chemboy! The tendency to gain or lose weight is said to be passed on in the genes. Some doctors are actually studying how to manipulate what they call the "skinny gene" in efforts to provide effective weight loss treatments. You might want to read this article - http://www.body-philosophy.net/weigh...es_weight_loss
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  6. #5 Re: 
    Forum Freshman Aures's Avatar
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    Well, metabolism is made of two phases, catabolism (complex matter breakdown/ it's consumption) and anabolism (it's synthesis/ cellular construction). The way they are balanced is what affects basically one's weight.

    Now, catabolism and anabolism as pillars of metabolism, are affected themselves by:
    enzymic (at the biochemical reactionary level, possibly anomalous);
    hormonal (as in Insulin equilibrating complex and simple carbohydrates);
    tumoral (e.g. of the thyroid would increase the general metabolism by overproducing thyroxin);
    physiological (growth, menopause, etc) and physical activity;
    genetic dispostion towards all of the aforementioned factors.
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  7. #6  
    Forum Freshman SapereAude's Avatar
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    Lean muscle mass increases metabolism. The more muscles the higher metabolic rate. Now, exercise doesn't actually speed up metabolisms, but what it does is burn fat, which increases lean muscle mass, which increases your resting metabolic rate.

    Another important factor is Breakfast. Throughout the night your body is in starvation mode and deprived of nutrients. To compensate, it slows down. So it is important to keep your body revved up by consistantly supplying it with nutriently dense food. When lean people overeat their metabolism is speeding up, whereas when fat people diet or skip meals it is actually slowing and storing axcess energy as fat. This is why you hear most fat women bitch about why they cant loose weight when they eat one meal a day. And us athletes, on the otherhand, are munching on food all day like pigs cuz regardless of how much we eat, we will fit into our high school jeans forever
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  8. #7  
    Forum Freshman Tony John C's Avatar
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    Quote Originally Posted by SapereAude
    Lean muscle mass increases metabolism. The more muscles the higher metabolic rate. Now, exercise doesn't actually speed up metabolisms, but what it does is burn fat, which increases lean muscle mass, which increases your resting metabolic rate.

    Another important factor is Breakfast. Throughout the night your body is in starvation mode and deprived of nutrients. To compensate, it slows down. So it is important to keep your body revved up by consistantly supplying it with nutriently dense food. When lean people overeat their metabolism is speeding up, whereas when fat people diet or skip meals it is actually slowing and storing axcess energy as fat. This is why you hear most fat women bitch about why they cant loose weight when they eat one meal a day. And us athletes, on the otherhand, are munching on food all day like pigs cuz regardless of how much we eat, we will fit into our high school jeans forever

    I disagree, exercise does increase metabolism. My reasoning is the definition of metabolism itself, defined as the sum total of all chemical reactions in the body. Burning fat is the break down of molecules to release energy, ie catabolism. The correct question is how do you increase your metabolism. To increase your metabolism, you need one simple thing, muscle. Muscle accounts for a large portion of your coloric usage. 1 pound of muscles burns about 40 calories a day, so if you had a guy that was 100 pounds of pure muscle and another was 110 pounds of pure muscle. The 110 pound man would burn 400 more colories per day on average. Exercise is an means to an end, not end to a means (i hope i used that right) The end being gaining muscle. A persons resting metabolic rate or RMR accounts for 80% of overall coloric usage, and exercise a mere 20%. With that in mind it would be impossible to use exercise to burn fat and lose weight, it is simply impossible. The goal of exercise is to build muscle by therefore increasing your RMR. Also by exercising using anaerobic respiration will temporarily boost your RMR, thus burning more calories. The reason it increases your RMR is that it uses both catabolism during the exercise, ie your muscles breaking down, and anabolism which builds your muscles back. Both use alot of energy, which should create a deficit of calories. One needs a deficit of around 3500 calories to lose a pound of fat. =) Though it doesn't matter how much muscle you have, if your diet is poor you will lose nothing. I do agree that genes do have a play on initial metabolism, but anyone regardless of the genes can increase there metabolism. Hope this helps you.
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