Your body needs certain nutrients to function. Foods that are considered healthy have more of those nutrients and less of the things that cause excess fat such as carbs. Red meat is an example of something you should eat in moderation because it is generally high in fat and other things that can have a negative effect on your body.
A big example would be white bread. The process that creates bleached flower basically takes away all health benefits of the initial wheat grain that it came from, leaving only simple sugars that your body burns quickly and stores as excess fat in your body. If you ate whole wheat bread instead it still has a lot of nutrients in it that your body can use efficiently and create less fat because the complex sugars are what your body burns more effectively.
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