It's about balance and combination.

Cuz if you eat too much vegetables you can basically cancel out other foods. You need to focus mainly on carbs in order to lose weight, because they burn slower and you will have much more energy, but you have to make sure that you run enough to burn them cuz if you don't then you will gain a lot of weight.

So carbs are what you really need in order to become quicker in the shortest time (still months though) but you need to really push yourself or else the diet will backfire on you.

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