Another myth that’s detrimental to health and fitness is the “all or nothing” mentality: You have to go all in if you want to achieve great results. You do everything correctly, or you might as well not even try. You either stay on that diet and make sure every meal is perfect, or you screwed up because you ate a cupcake and go back to previous habits. All, or nothing.
There are limitless examples of the failure of the all or nothing approach: Remember the teacher who lost 56 pounds eating nothing but McDonald’s for six months? During this experiment guided by a few basics rules (e.g., limit calories to 2,000 per day, track 15 nutrients to meet the standards of the FDA) he managed to lose 56 pounds while lowering his cholesterol and triglycerides (from 249 to 170 and 156 to 80, respectively).