gesundheitlich
health-related
Relates to the health of a person or thing; concerning health.
Aus gesundheitlichen Gründen musste er seine Reise absagen.
For health-related reasons, he had to cancel his trip.

health-related
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health-related
Relates to the health of a person or thing; concerning health.
Aus gesundheitlichen Gründen musste er seine Reise absagen.
For health-related reasons, he had to cancel his trip.

The adjective 'gesundheitlich' (health-related) is derived from the noun 'die Gesundheit' (health) with the ending '-lich' (-ly/-al). This ending often forms adjectives from nouns and means 'in relation to' or 'of the kind of.'
Beruflicher Stress kann zu gesundheitlichen Problemen führen.
Work-related stress can lead to health-related problems.
'Gesundheitlich' (health-wise/in terms of health) is very often used as an adverb to describe a person's condition. It then often appears with verbs like 'gehen' (to be doing) or 'sein' (to be).
Mir geht es gesundheitlich wieder viel besser.
Health-wise, I'm doing much better again.
A very common phrase is 'aus gesundheitlichen Gründen' (for health-related reasons). Other typical combinations are 'gesundheitliche Probleme' (health problems), 'gesundheitliche Vorteile' (health benefits), or 'der gesundheitliche Zustand' (health condition).
Sie konnte aus gesundheitlichen Gründen nicht an der Feier teilnehmen.
She could not attend the celebration for health-related reasons.
healthy
'gesund' and 'gesundheitlich' are closely related, but they are used differently. 'gesund' describes a state or an effect: a person is healthy, or food is healthy. 'gesundheitlich' only means that something concerns health. It usually describes reasons, problems, consequences, or questions. Learners can easily confuse the words because they look similar. But you do not say 'gesundheitliches Essen' if you mean that food is good for the body; then you say 'gesundes Essen' (healthy food). For topics like complaints, risks, or reasons, 'gesundheitlich' fits.

Aus gesundheitlichen Gründen verschiebt Maria ihren Termin.
Maria is postponing her appointment for health-related reasons.
Er ist gesund und kann heute wieder zur Arbeit gehen.
He is healthy and can go back to work today.