I know there are a ton of other variables and factors, but the whole thesis is somewhat flawed. The life expectancy of humans during the Paleolithic era was around 33 years. Compare that to todays world average of aroung 67 years and it make you wonder, we must be doing something right....it just needs tweaking. The Paleo diet is nothing new. Eat healthy fruits, vegetables, protiens and avoid processed foods. Doctors and nutritionist have been advocating this from the get go. It's nothing revolutionary. It's an oversimplification, but our body converts most of the food we eat into a form sugar (glucose). It either burns it or stores it as fat.
A Calorie isn't something imaginary, it's a real and measurable unit of energy. It gets complicated because not everyone burns calories at the same rate, so we must make do with an average. 2,500 calories for an adult male...some people burn less, some burn more. 1 pound of fat tissue is about 3,500 Calories, so you need to have that much of a defecit to burn off 1 pound of fat. To do that, you need to eat less and/or burn more calories by working out. This is science, not just a fad with a catchy name. Our ancestors didn't sit at a desk waiting for take-out, they were out there running, walking, hunting & basically moving around for miles in search of food. Look at programs like P90X and you'll see results because those sessions involve a lot of movement and burn a ton of calories.
.... or another example is someone like Michael Phelps who consumes over 12,000 calories a day eating pretty much whatever he wants because he burns it all off.
If you eat fewer calories than you burn exercising, you lose weight. It really is that simple. I'd like to think of diet and excercise as a safety net to one another. To sustain a healthy weight, diet alone doesn't work & excercise alone doesn't work. By being fully commited to doing both, your hard work doesn't fall off the track completely if you miss a week of exercise or ate something you shouldn't be eating.
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