Losing weight is simple:
calories consumed<calories expended
Being healthy is different. Not only does it require a reasonable diet, but exercise plays a huge role as well. A simple way to eat a healthy diet is to use the "caveman" rule: If a caveman could find it and eat it, then it's probably good. Lean meats, fish, fruits, vegetables, nuts, and eggs, washed down with water.
Simple, too bad simple doesn't necessarily mean easy. I mostly follow my own advice, expect for the ice cream I eat every night, and a few other indulgences.
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"The mass of men lead lives of quiet desperation." Henry David Thoreau
His disciples asked him, "Rabbi, who sinned, this man or his parents, that he was born blind?"
Jesus answered, "Neither he nor his parents sinned; it is so that the works of God might be made visible through him. "
John 9:2-3