borghe said:
ummm...... no... people get fat for one reason and one reason only. They take in more calories than they burn. stay on a low carb diet and eat 3000 calories a day of fat and protein with little to no activity and guess what.. you'll be fat in no time.
The whole calories in vesus calories out thing is misguided because:
1. You're insinuating that the body does not change hunger/CaloriesIn based on CaloriesOut.
2. You're inferring causality without a basis. Saying that overeating is the cause of obesity is like saying that drinking too much causes alcoholism. It doesn't explain why the person does it.
3. Your equation, I'm assuming is this:
deltaCalories = CaloriesIn - CaloriesOut.
It's wrong. Here is the correct equation:
0 = CaloriesIn - CaloriesOut +/- CaloriesToOrFromFat +/- caloriesFromCannibalizedTissueOrReducedMetabolism
Insulin controls the flow of calories into fat. If insulin is high, calories go into fat cells, regardless of the number of calories needed vs consumed.
So if you eat a high carb diet that has a high insulin response, you may need 2500 calories in your muscles, organs. Insulin doesn't care, it was the evolutionary response to a bunch sugary fruits and vegetables showing up just before periods of famine (winter). Your body is programmed to store fat, because natural selection has weeded out genetics such that people store fat in anticipation of winter/famine. It is also a way for the body to reduce blood sugar, that only carbs raise so that it doesn't get to toxic levels.
So check out happens to this equation when you consume 2500 calories, but insulin stores 400 calories as fat:
0 = CaloriesIn - CaloresOut +/- CaloriesToOrFromFat +/- caloriesFromCannibalizedTissueOrReducedMetabolism
0 = 2500 - CaloriesOut - 400 +/- caloriesFromCannibalizedTissueOrReducedMetabolism
0 = 2100 - CaloriesOut +/- caloriesFromCannibalizedTissueOrReducedMetabolism
2100 = CaloriesOut +/- caloriesFromCannibalizedTissueOrReducedMetabolism
Now suppose your muscles and organs need 2500 calories under normal metabolic rate to break even.
2100 = 2500 +/- caloriesFromCannibalizedTissueOrReducedMetabolism
caloriesFromCannibalizedTissueOrReducedMetabolism = 400
This means that you need to:
1. Reduce your metabolic rate. Ie, your body intentionally weakens you through fatigue or poor circulation/heat.
2. Cannibalize muscles and organs.
3. Overeat (but you still gain fat regardless if you decide to).
It is only until the body reduces insulin, or that body fat is accumulated enough such that current insulin levels cannot hold any more fat, that this problem goes away.
If you go on a low carb diet, insulin is reduced, the body fat % setpoint is reduced, and the body just feasts on body fat until the new setpoint is reached without exercise or hunger.
edit - I'm not saying it's right that I am figuring it this way or right that people treat it this way... just pointing out that to many, low carb means eliminate the carbs which effectively is creating the calorie deficit for weight loss.
Not necessarily. There are several studies from the 1950s/1960s on Pennington's diet (Atkins basically) where subjects consume 3-5k calories, lose fat and gain muscle. Their muscles were so deprived on energy due to excessive insulin, that simply getting the muscles a stable supply of energy made them grow to their natural, unstimulated size.