Thanks to an excellent suggestion from "Maggie," responding to my Wiley Coyote call for help…
Both words ("healthy" and "healthful") are adjectives. But "healthy" refers to the condition of a person, an organization, or a relationship. "Healthful," on the other hand, describes activities, practices, or behavior that contribute to good health…a healthy person, for instance.
adjective ( healthier , healthiest )
in good health: : feeling fit and healthy.
• ( of a part of the body) not diseased : healthy cells.
• indicative of, conducive to, or promoting good health : a healthy appetite | a healthy balanced diet.
• (of a person's attitude) sensible and well balanced : a healthy contempt for authority.
• figurative in a good condition : the family is the basis of any healthy society.
• desirable; beneficial : healthy competition.
• of a satisfactory size or amount : making a healthy profit.
having or conducive to good health : healthful methods of cooking vegetables.