That I was slim with a "high carbs" diet for 20 years also makes me doubt the carbs theory a bit.
Not all carbs are the same. Sugar, potatoes and refined flour are very concentrated, fast to digest and process. Also there are the interactions. You can lose weight eating only steaks.
The thing is that carbs diet is effective for the people that are already overweight. It's not as if you need to do them to stay slim. Actually I don't do it anymore (I eat less, avoid fats and prefer fruit and salads, also works). But I can witness it works.
Not all carbs are the same. Sugar, potatoes and refined flour are very concentrated, fast to digest and process. Also there are the interactions. You can lose weight eating only steaks.
The thing is that carbs diet is effective for the people that are already overweight. It's not as if you need to do them to stay slim. Actually I don't do it anymore (I eat less, avoid fats and prefer fruit and salads, also works). But I can witness it works.