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My common reaction to people saying this is the simple fact that you do not get bigger if you consume less calories than you burn throughout a day. If you eat

My common reaction to people saying this is the simple fact that you do not get bigger if you consume less calories than you burn throughout a day. If you eat 2000 calories, and you burn 2000 calories then you do not gain weight, period. Yeah, some people burn calories at an easier/faster rate by just living (they have a fast metabolism), but it's a known fact that walking x miles will burn y calories, so you eat proportionally to your caloric expenditure. Any obese person that argues otherwise is ignoring physics, and is just not trying. My gut feeling (sorry!) is that these obese individuals playing the genetic card are confusing their hunger for their metabolism. It is shown that obese individuals get hungry sooner and that hunger is present longer even after eating (it's a hormone that causes hunger), but this is still preventable.

DrSprout 16y ago
It's a lot more complicated than that. The human body is not a simple engine with a fixed metabolism. Even if we switch to a more variable metabolism model, simply scaling your eating to your activity will not necessarily cause you to lose weight. The body first looks for equilibrium, and then when equilibrium is a problem it will start looking into stored energy. It's not just a question of "activity x burns y calories." Some of those calories are burnt in healing - our muscles strengthen by tearing, and then healing larger. You don't eat, your body may delay that maintenance, waiting until energy is available. So you haven't actually lost any weight - you've just prevented yourself from gaining weight, which is actually a bad thing, because that muscle would make you healthier.
- cullenking 16y ago
  Wait, so if I burn 2000 calories in a day but only consume 1500 calories, I won't lose weight? I am not arguing that it's not as simple as the 500 calorie deficit going 100% towards fat reduction, but I don't see how it is possible to not lose weight like this. Weather or not the exercise builds muscle, it will reduce mass.
  - DrSprout 16y ago
    Naturally, if you consume 25% fewer calories than you burn, you will lose weight. However, you will be less healthy as a result. There's a very narrow band where you can actually lose weight in a healthy manner. It varies from person to person, and furthermore, you are making yourself weaker and more vulnerable to disease if you are eating less than your caloric requirements. So you're saying "you're fat, that's your problem, you should just eat less." The issue is that eating less causes its own problems, and for some people those can seriously outweigh the benefits of being thinner. For some people, their ability to metabolize fat is so retarded that what you suggest really isn't feasible. They will likely starve to death before they get rid of their fat. These people are, of course, rare, but the same issue exists in lesser values for other segments of the population.
    - mrtron 16y ago
      The human body is incredibly resilient. You can gain or lose 25 pounds next month easily and without any ill effects of any kind. Try it. I would like to see any sort of evidence that it is possible for some people to have very little ability to metabolize fat. I think the body type argument is a rounding error when it comes to obesity. Visit Asia. There are incredibly few obese people, and most people are probably too thin. Why? Caloric intake and expenditure.
      - cullenking 16y ago
        I don't have any supporting evidence, but I have read over and over that you cannot exceed more than 2 pounds of loss per week without doing some damage. 25 pounds in a single month is HUGE.
        tl 16y ago
        Anecdote: Myself, plus 3 guys I work with decided to lose weight. We all succeeded (I lost about 50 pounds over 9 months), but the guy who lost 3.5 pounds per week started having serious medical issues.
    - 16y ago
stoney 16y ago
It's a bit unfair to say obese people are "just not trying". They might be trying very hard, they're just not trying hard enough. Getting from being obese to an average weight is much harder than maintaining an average weight. Once you get yourself into an obese condition you've got a difficult road back out. Though I agree with your basic argument - if you eat less than you burn you will lose weight. The tricky part is that your body can vary what it burns to some degree (your metabolism can speed up and slow down), so it's not entirely obvious how much you are burning.

DrSprout 16y ago

It's a lot more complicated than that. The human body is not a simple engine with a fixed metabolism. Even if we switch to a more variable metabolism model, simply scaling your eating to your activity will not necessarily cause you to lose weight. The body first looks for equilibrium, and then when equilibrium is a problem it will start looking into stored energy. It's not just a question of "activity x burns y calories." Some of those calories are burnt in healing - our muscles strengthen by tearing, and then healing larger. You don't eat, your body may delay that maintenance, waiting until energy is available. So you haven't actually lost any weight - you've just prevented yourself from gaining weight, which is actually a bad thing, because that muscle would make you healthier.

cullenking 16y ago
Wait, so if I burn 2000 calories in a day but only consume 1500 calories, I won't lose weight? I am not arguing that it's not as simple as the 500 calorie deficit going 100% towards fat reduction, but I don't see how it is possible to not lose weight like this. Weather or not the exercise builds muscle, it will reduce mass.
- DrSprout 16y ago
  Naturally, if you consume 25% fewer calories than you burn, you will lose weight. However, you will be less healthy as a result. There's a very narrow band where you can actually lose weight in a healthy manner. It varies from person to person, and furthermore, you are making yourself weaker and more vulnerable to disease if you are eating less than your caloric requirements. So you're saying "you're fat, that's your problem, you should just eat less." The issue is that eating less causes its own problems, and for some people those can seriously outweigh the benefits of being thinner. For some people, their ability to metabolize fat is so retarded that what you suggest really isn't feasible. They will likely starve to death before they get rid of their fat. These people are, of course, rare, but the same issue exists in lesser values for other segments of the population.
  - mrtron 16y ago
    The human body is incredibly resilient. You can gain or lose 25 pounds next month easily and without any ill effects of any kind. Try it. I would like to see any sort of evidence that it is possible for some people to have very little ability to metabolize fat. I think the body type argument is a rounding error when it comes to obesity. Visit Asia. There are incredibly few obese people, and most people are probably too thin. Why? Caloric intake and expenditure.
    - cullenking 16y ago
      I don't have any supporting evidence, but I have read over and over that you cannot exceed more than 2 pounds of loss per week without doing some damage. 25 pounds in a single month is HUGE.
      - tl 16y ago
        Anecdote: Myself, plus 3 guys I work with decided to lose weight. We all succeeded (I lost about 50 pounds over 9 months), but the guy who lost 3.5 pounds per week started having serious medical issues.
  - 16y ago

stoney 16y ago

It's a bit unfair to say obese people are "just not trying". They might be trying very hard, they're just not trying hard enough. Getting from being obese to an average weight is much harder than maintaining an average weight. Once you get yourself into an obese condition you've got a difficult road back out. Though I agree with your basic argument - if you eat less than you burn you will lose weight. The tricky part is that your body can vary what it burns to some degree (your metabolism can speed up and slow down), so it's not entirely obvious how much you are burning.