Why do I need to eat??

Because our body is a high performance machine ,and like any machine, it needs gas to go. That fuel comes in the form of nutrients -vitamins, minerals, carbohydrates and fat. In our body turns carbohydrates into energy and proteins into building blocks to help you grow taller, builds muscle, prevent illness, and have healthy hair, teeth and skin. As you would expect, healthy foods make the best fuel. Eat nothing but junk food and you will ruin your engine. 

How long could I go without eating?? 
That depends on many factors, are you healthy?  Skinny?  Will you need to struggle until your next meal or just lase under a palm tree? People have survived more than 10 weeks without food. But they had water and didn't need to move around too much. Starvation takes a horrible toll on the body. However causing awful symptoms. And that's not even counting the pain. Ever forget to pack a lunch?  Pangs of starvation are a hundred times worse than those of hunger.

Why it is so hard to eat just one potato chip??
It's not the potato in the chip that drives your taste buds wild--its the chips salty flavor. Your body craves salt because it needs it to survive. (salt help you tissue stay hydrated and serves other vital functions)
Too much of a good thing can be bad. However consuming too much salt can lead to heart disease and other health risks.

Why does junk food taste better than healthy food? ?
Salt isn't the only substance your body craves. The human tongue prefer sweet, salty and fatty flavors to the more subtle taste of veggie, whole grain beans and other good for you  foods. Sweet fruit and fatty meats pick a lot of energy, which was essential to our ancestors 

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