May I ask why you do not lift weights? It is important to have both components for a sound workout routine. You do not need to fear having a bodybuilders body from lifting weights b/c they get that through fine tuning their diet according to their macros and workout on average of 6 days a week, twice a day. I know some bodybuilders and they are amazing arts of work, but like you, I just want to be fit and healthy and the only time I've had a six pack is when I was working out and eating like a body builder, w/no cheats!!!! Ya, that only lasted a few years then I found ice cream again...
The idea behind eating 5 to 6 small meals a day is to rev up the metabolism. Our bodies temperature rises during the digestion process and when our bodies temperature rises, we burn calories at a higher rate (thermogenesis). So, by eating 5 to 6 small meals a day you are reving up your metabolism. Larger meals less frequently tend to store more as fat b/c we can only process x amt. at one time, whereas w/the more frequent small meals, it will almost all be used for energy. There are also blood sugar benefits to eating smaller more frequent meals. If you've noticed, after a huge meal we crash. This is often b/c of a spike in blood sugar, which when it crashes, so do we. This is not experienced w/5 to 6 meals a day. Of course, quality is key as well!!!
Well, I'm rambling and I hope that made sense and did not seem too confusing!!