If, however, you' re after optimum health that is, feeling great rather than OK and rarely getting sick, as opposed to merely avoiding deficiency diseases such as scurvy (which is what the RDAs are based on) - then think again. Modern life places extra demands on our bodies. Stress, pollution, medications, food additives, food processing all increase our need for nutrients. So if you' re up for boundless energy, sharp brain function and minimal illness, including reducing your risk of cancer, heart disease and other killers, supplementing a good diet with nutrients is essential. That' s why I recommend every body take at least a high strength multivitamin every day and an additional lg of vitamin C.