... Tubers, such asPOTATOES and CASSAVAS, and root vegetables, suchas parsnips, also supply starch. BEANS and seeds of legumes, rich sources of protein, also contain 40percent of their weight as starch. ... walls and structures. The major classes of fiber possess different sugars asbuilding blocks. CELLULOSE, one of the most com-mon fibers, contains only glucose. HEMICELLULOSES,PECTINS, GUM, and ... ath-letes, and healthy people who rely on PROCESSEDFOOD. Chromium loss increases with injury, STRESS,AGING, and strenuous EXERCISE. Consuming exces-sive SUGAR increases chromium losses...