This document discusses several potential health issues: drinking too much diet soda can trigger headaches from aspartame breaking down into formaldehyde; eating too much sugar can lead to candida overgrowth causing skin irritation; cracks at the mouth corners may signal a B-vitamin deficiency from a processed food diet; and keratosis pilaris commonly appears as small bumps on the upper arms and is exacerbated by the sun, spicy food, and tobacco but can be treated with soaking, exfoliation, or prescription creams.