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Exercise is good, but the key to losing weight is the supply side, i.e., stuffing yer piehole less.
At the end of the day, it is really essentially a math game involving calories. Eat less calories then you burn and you will lose weight.
Exercise is fine, but it's relatively hard to exercise a calorie off, and given our crap food filled society, very easy to put a calorie in. You can go for a brisk walk for an hour and burn 350 calories, but then put those back in in 30 second and 1 little Krispy Kreme glazed.
And, people tend to overestimate how many calories they burned, or the effect on their metabolism, and then eat more or "treat" themselves because of their great workout.
I think low carb diets really do work, although not exactly for the reason most people think. They work because protein foods tend to be (1) very filling, (2) low in calories, and (3) self limiting. For ex., a chicken breast from El Pollo Loco is 180 cals. 2 of those is a filling lunch, but only 360 cals, and will keep you feeling full for quite a while. 360 cals of "carby" foods is nothing, and you will be hungry again in an hour. Protein is also self limiting because it's so heavy and satiating. For ex., you could eat a Whopper meal with fries and a soda, and that would probably be 1200 calories, but it would be very difficult to put down 1200 calories of roast chicken.
So low carb tends to work because in reality, if you're really doing it, it is actually low calorie.
I do agree, though, that you need to find what works for you. I know people that have lost a lot on low carb, and others that couldn't do it successfully. My neighbor (female) just lost around 30 lbs on Weight Watchers "Flex plan."
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