Americans seem to have a taste for extreme diets.

Gluten-free, sugar-free, dairy-free, and "Paleo" diets are all the rage.

Nutritionists say each type of plan has their benefits and drawbacks.

For people with gluten or lactose sensitivities, cutting them out brings immediate results.

But if you don't notice any positive changes quickly, there's not much point in avoiding them!

Also, many gluten-free products are higher in calories than their glutinous counterparts.

However, nutritionists and dieticians all agree there's absolutely no harm in cutting out sugar! Boo!

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