Dietetics: Dietetics is the science of how food and nutrition affects human health. The field of dietetics has a strong emphasis on public health and a commitment to educating about the importance of making proper dietary choices. The food we eat has a significant impact on our health, according to a number of scientific studies. Changes in diet can help prevent or control many health problems, including obesity, diabetes and certain risk factors for cancer and heart disease. Dietitians help people in communities maximize their available resources to achieve the best possible nutrition, thus optimizing health and preventing disease.