Older doctor and the younger doctor

A young doctor had moved out to a small community to replace a doctor who
was retiring. The older doctor suggested that the young one accompany him on
his rounds, so the community could become used to a new doctor. At the first
house a woman complains, 'I've been a little sick to my stomach.'
The older doctor says, 'Well, you've probably been overdoing the fresh
fruit. Why not cut back on the amount you've been eating and see if that
does the trick?'
As they left, the younger man said, 'You didn't even examine that woman?
How'd you come to the diagnosis so quickly?''I didn't have to. You noticed I
dropped my stethoscope on the floor in there? When I bent over to pick it
up, I noticed a half dozen banana peels in the trash. That was what probably
was making her sick.'
'Huh,' the younger doctor said. 'Pretty clever. I think I'll try that at the
next house.'
Arriving at the next house, they spent several minutes talking with a
younger woman. She complained that she just didn't have the energy she once
did and said, 'I'm feeling terribly run down lately.'
'You've probably been doing too much work for the Church,' the younger
doctor told her. 'Perhaps you should cut back a bit and see if that helps.'
As they left, the elder doctor said, 'I know that woman well. Your
diagnosis is almost certainly correct, but how did you arrive at it?'
'I did what you did at the last house. I dropped my stethoscope and when I
bent down to retrieve it, I noticed the preacher under the bed.'