The idea is you can eat whatever, but when you come to it there's a natural limit for most people then you feel full and don't want to eat more. If you imagine

The idea is you can eat whatever, but when you come to it there's a natural limit for most people then you feel full and don't want to eat more. If you imagine it to extremes, if you put all your food for the day on a plate and gave yourself 1 hour how much could you eat if you weren't trying to make yourself sick? For most people of you only eat between noon-8pm, say (”18-6”) then you'll reduce your calorie intake naturally. Couple it with appropriate exercise and you'll lose weight (doesn't mean you'll be healthier necessarily though!).