adjective
1
BAD : I didn't feel suitable to a career in medicine.
GOOD : I didn't feel suited to a career in medicine.
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suitable (for) = right or appropriate for a particular purpose: 'The film isn't really suitable for children.' 'We'd like to give her the job but her qualifications aren't suitable.'
suited to = having the qualifications, experience, personality etc that make you suitable for a particular job or situation: 'Her interest in poetry makes her better suited to a literature course.'
2
BAD : The food they gave us wasn't suitable to be eaten.
GOOD : The food they gave us wasn't fit to eat.
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be fit to eat/drink/live in etc = (of the condition or quality of something) good enough for the stated purpose: 'The house hadn't been cleaned for months and wasn't fit to live in.'