"what he says is that there are no advantages from a weight loss point"
A diet is much more than counting calories. It's about managing to maintain a set amount of food for your objective.
Here's an experiment you can do. Replace all your food (lunch/dinner) with chicken fillets (for the daily need of protein), top up calories with sweet potatoes and olive oil for fat needs.
See how long you can keep up with this diet. This is a nutritionally sound diet (except for micronutrients), and if you calculate your daily needs you will maintain your weight (or you can adjust for weight loss or gain)
But a regular person will probably lose weight because (s)he will get sick of it fast and eat less!
The calories matter, but two things can have an equal number of calories and one may make people feel hungry after 1h and the other may make people feel full for the whole day. Guess who's more likely to lose weight?!
A diet is much more than counting calories. It's about managing to maintain a set amount of food for your objective.
Here's an experiment you can do. Replace all your food (lunch/dinner) with chicken fillets (for the daily need of protein), top up calories with sweet potatoes and olive oil for fat needs.
See how long you can keep up with this diet. This is a nutritionally sound diet (except for micronutrients), and if you calculate your daily needs you will maintain your weight (or you can adjust for weight loss or gain)
But a regular person will probably lose weight because (s)he will get sick of it fast and eat less!
The calories matter, but two things can have an equal number of calories and one may make people feel hungry after 1h and the other may make people feel full for the whole day. Guess who's more likely to lose weight?!