A macrobiotic diet (or macrobiotics), from "macro" (large) and "bios" (life), a dietary regimen which involves eating grains as a staple food supplemented with other foodstuffs such as local vegetables avoiding the use of highly processed or refined foods and most animal products. Macrobiotics also addresses the manner of eating by recommending against overeating and requiring that food be chewed thoroughly before swallowing. Macrobiotics writers present it as a means of combating cancer.
The macrobiotic theory contradicts accepted scientific and medical knowledge. Their claim, to be able to cure all diseases,[according to whom?] is considered to be refuted and medical professionals do not consider that there is evidence that a macrobiotic diet is useful as a cure for cancer. The traditional form of the macrobiotic diet can lead to serious nutritional deficiencies.