Lifestyle diseases are diseases that increase as countries industrialize and are linked to how people live. They include diabetes, obesity, heart disease, stroke, and osteoporosis. Diabetes is a metabolic disease involving insulin that can damage major organs. Obesity puts one's health at risk by accumulating too much fat. Heart disease covers many conditions affecting blood flow and the heart that can be fatal. Stroke affects brain function and may cause paralysis. Osteoporosis is a bone condition caused by calcium imbalance that makes bones brittle. Prevention involves a balanced diet, exercise, sleep, recreation, and avoiding smoking and alcohol.