Which one of these plans would NOT be considered a "fad" diet?

The grapefruit diet (where you eat grapefruit with every meal)

Atkins (very low carbs, high on protein and fats)

Weight Watchers (you can eat anything, but count total calories)

A diet where you can only eat certain foods at certain times of the day

Question

Which one of these plans would NOT be considered a "fad" diet?

The grapefruit diet (where you eat grapefruit with every meal)

Atkins (very low carbs, high on protein and fats)

Weight Watchers (you can eat anything, but count total calories)

A diet where you can only eat certain foods at certain times of the day

Ultrilliam · Answer

Weight Watchers (you can eat anything, but count total calories)