Well, 'getting in shape' is really a relative term. You could have an extra 25 you might want to lose, but you wont necessarily have to lose that weight to be 'in good shape.' I'm no expert, but I wouldnt place
too much emphasis on a little adipose
Concentrate on things that will
really be of benefit you, like your ZZ practice! Losing a few pounds is relatively trivial. Some people will get a little extra gut and its just their body type, they wont ever be able to fully get rid of it. My brother fries at me all the time because I can keep a flat stomach and he has a hell of a time keeping his sixers sexy, even doing five times the amount of working out that I do.
Regarding eating...its a fact that digestion takes energy in order to produce energy! That's why a big meal puts you on the couch right quick. This is something you'll have to discover for yourself - a proper eating regimen, how much how often and when (of course, a professional will be able to work with you and tailor your intake to
you, but there's professionals for everything out there these days -
disclaimer: I'm not one of them! ) That will tie into your martial arts training - doing a lot of physical exercise will absolutely require more calories, so there will be times that you will naturally eat some more when heavier training is involved.
IMHO, fasting a day a week will probably get you more results than eating once a day, but the two aren't mutually exclusive, and you seem to have a decently physical regimen on top of that so you may only want to eat once some days and not others. My humble advice would be to stay diligent with the ZZ, eat when you are hungry (but not after 7 or 8pm) and add meditation in the evenings. Not sure what the extent of your experience with meditation is...
The one constant is change - so whatever you're doing right now, you're not going to be in the same spot in 6 months without REALLY trying
Get to know thyself well enough to flow with those changes!