Eating vegetables, aside from anything else, alkalizes your body as opposed to making it more acidic. All ailments (germs, bacteria, viruses, inflammations, etc.) absolutely LOOOVE acidic environment in the body, so the more you alkalize it, the healthier you will be.
That's as condense of an explanation as I'm willing to go into without delving into hours-long discussions...
:-))

...And as for the "sharpness" factor, I think the app might suggest the use of smaller aperture, which in turn might give your photos overall sharper look.

That's only partially correct. An incident meter just has to be used in the same light as the subject and held at the correct angle relative to the subject.

For example, you can measure the light falling onto the side of a building or other outdoor object that's in full sun, even if it's at some distance, so long as you are also standing in full sun and align the meter to be roughly parallel to the wall (or side of any other object) that you're photographing.

OTOH, if the you're standing and metering in the shade, but the subject is in full sun.... or vice versa... an incident meter would be incorrect.

In studio situations with strobe or any other form of artifical light source, what you say is correct: It's necessary to meter right next to the subject. This is due to light fall-off over distance.