Not true at all.
Losing weight is very simple - 3500 calories = a lbs of fat.
A daily deficit of 500 calories either through diet or exercise will yield one lbs weight loss per week in almost all people.
The biggest problem is that most people grossly underestimate how much they are eating and overestimate how many calories they are burning through physical activity.
Starvation does not work either since the bodies metabolism will shut down and you will burn muscle and not fat which is a disaster for the body.
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apparently if these age/weight/height/active or sedentary things are correct I can lose weight by eating as much as 2,300 calories per day
I lost 37 pounds a few years ago by counting calories. I counted the calories I burned working out (just trusted the digital display on the elliptical machine at the gym) and counted the calories I consumed using the info on the packages or checking on-line. It worked like a charm for me. Now, I do know a few people who do count every calorie just like I did and they still can't lose weight. They have some kind of issue with their metabolism, apparently. But, you're right. For most people that simple formula, if followed carefully, will work.
<The biggest problem is that most people grossly underestimate how much they are eating and overestimate how many calories they are burning through physical activity.
There is a British show on YouTube called ‘Secret Eaters.’ It places cameras in the homes of people who swear they don’t eat ‘that much’ and don’t understand why they can’t lose weight.
What they don’t tell the families is that they send private detectives after them and film and buy all the same stuff the family members buy or have at work (like left over donuts in the office kitchen).
People forget that they stopped for food on the way home, that they ate after going to the gym, or that they nibbled the whole time they were making dinner. It was fascinating.
One thing about the Brits, they sure like to drink. Many of the people would lose weight instantly if they cut out the constant drinking - and because they drink with their meals, lunch and dinner, it is easy to lose track of how much one is drinking. It’s worth a watch.