What Gail said, that strategy all on it’s own ups your vitamins, minerals and everything else while cutting calories and fat.
Also, since I think your thinking ‘diet’ drink only water, or at least calculate your actual water needs properly and make damn sure you do it. DO NOT try to chug it once a day, it’s useless and makes you hate it. Keep a bottle nearby with a straw or pop top and sip all day. Anytime the phone rings at work, take a sip, for every shirt you fold at home take a sip, take a normal routine behavior and associate it with one sip, you’ll be amazed how hydrated you can become.
And to stick with your small meals more often plan, VARIETY will keep you going.