When on a low carb diet for a period of time (or any one diet), you body will adjust to attain homeostasis. So lets say its a low carb diet, you body will go into store mode....once you cheat or carb up, your body notices the extra cals and carbs and send out a signal saying "the starvation is over" and in turn your thyroid becomes more active , speeding up your metabolism, so when you go back to the low carb, your in prime fat burining mode
maybe my explaination of ones reason to carb load will explain the purposes....but yea, like makevelli said, theres also a huge psycological boost and increase in moral when you feed yourself during a low carb diet...for two reasons, you get to eat the food you enjoy AND the increase in blood sugar (fuel for your body) can provide a 'boost' for your brain and body...you might even find you can think more clearly
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