Logical bases (five of which are outlined) underlie action in nutrition and aging. First, nutrition, health, and aging form an integral triad affecting all. This basis has been applied to the conceptualization of the Nutrition Program for Older Americans (NPOA). Second, in North America, malnutrition is a sequitur of disease, whether physical, metabolic, emotional, or attitudinal. This basis is being applied by NPOA and other programs in an effort of cope with the pathologic conditions that bar proper nutrition. Third, since aging is a lifelong process, good nutrition and health practices must be applies throughout life. This basis will become effective only when the present image of the aged improves to the point that younger persons will strive for effective longevity. Fourth, changes in lifestyle to avoid risks have positive value. This basis requires professional and political leadership if it is to become widely adopted. Fifth, acute illnesses and accidents require immediate attention to nutritional and other factors if needless morbidity and mortality are to be avoided. This basis requires far more education of health professionals and lay persons to obviate such tragedies. All these bases are the infastructure for other actions directed at improving the image of today's aged and thereby diminishing the fatalism of younger persons and augumenting their determination to adopt lifestyles compatible with long, active, happy and productive lives.