10. Take supplements. Vitamins and minerals are essential to health. When there is a deficiency people are sick. For example, not having vitamin C leads to scurvy, where one first suffers from fatigue, nausea, loss of appetite, diarrhoea, fever and pain in joints and muscles. In advanced cases the symptoms are more serious including bleeding gums, loose teeth, easy bruising and bleeding, swelling, and the stopping of bone growth in babies and children. Infact, vitamin C was discovered as a result of figuring out the cause of scurvy. So while it is obvious that below a certain level of vitamin C one gets sick, it isn’t so clear how much healthier one can get with the optimal level of the vitamin. There aren’t symptoms for peak health.