All diets ahve advantages and diasdvantages. And the GI diet is no different.

Pros: you can order meals prepared by chefs online, the diet stabilizes blood sugar, you can eat several times daily and you will experience fewer headaches along with less irritability and will have more energy.

Cons: Some foods must be avoided completely, the several daily meals will need to be planned out, and there aren't options as far as fast food is concerned.

In short: this is a diet that works for anyone wanting fresh and delicious foods that provides energy but it's not necessarily the greatest fit for those who don't have time to plan meals.