My 64-year-old father is addicted to mayonnaise

Dear Doctor; My father is 64 but has a soft spot (appetite) for peanut butter and moyannaise. He doesn’t have lifestyle disease, though, and claims the regular exercise he does clears any bad things he consumes whenever we say the two are not good for health. Is peanut butter really bad? How bad? How about moyannaise? What alternatives could we have the old man feeding on?
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Times Reporter