What Happens to Your Body When You Cook with Foil?

5. Aluminum Accumulation in Bone Tissue
The human body can excrete small amounts of aluminum, but excessive consumption causes the metal to be stored in hard tissues like bones. Aluminum competes with calcium for absorption in the bones and eventually replaces it, which reduces bone density over time. Health Hazard: The habitual use of aluminum foil in cooking is considered a contributing factor to osteoporosis and the weakening of the skeletal structure in older age.