2. Won't I be missing out on nutrients if I limit myself to 800 calories two days a week?
People need to stop thinking of overall nutrition in terms of 24-hour periods. It's almost impossible to ingest all your necessary vitamins, minerals, phytochemicals, and assorted micronutrients on a non-fasting day, let alone a fasting day. Think in terms of weeks, not days. In other words, do you think you ate well enough this past week to meet all your nutritional needs? That's the pathway to health.
Furthermore, the body stores most nutrients in case you don't ingest them every day. Consider the much ballyhooed vitamin B12, a favorite son of hucksters everywhere. While it's considered essential to health, the vast majority of people have a big enough supply stored in their liver to last five years. Add to that the eye-opening fact that over the course of your lifetime, you only need about 40 milligrams of B12, which is a speck of powder half the size of a single baby aspirin.
So no, you won't be missing out on vital nutrients.
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