Food is a much more individualized issue.
I tend to bring very little on a daysail, unless it goes over four hours or so. For cruising longer distances, during the day, while sailing, I'm fine with any snack food that's not so sweet/salty as to make me thirsty. Fruit are great, too. Plenty to drink, including juices or sports drinks on longer, hotter days, or a thermos with coffee on colder ones. All of these stored somewhere on the boat where they can be accessed w/o problems while under way.
If your destination is a bit off the beaten path, bring extra rations, esp. water, for a day (or more).
Compared to bicycling, sailing burns much fewer calories
In hot weather, it can mean no big appetite for dinner, once on land. I found that I tend towards bigger breakfasts, if anything, when I'm spending the whole day outdoors. I always bring some kind of stove, single burner, propane or gasoline, not super skimpy so it doesn't take forever. Can't live without morning coffee and where evenings are cooler, hot soup.
Some people like pre-packaged meals that can be eaten cold or heated up. I tend to go for hot cereals for breakfast, filling but sidesteps dealing with keeping eggs or bacon fresh. Generally, I tend to get by without cold chests, ice, etc. Just another complexity, and doesn't work for more than 24h or so, that is, not on any weeklong cruise without having to hit civilization. UHT milk in pint-size works well without refrigeration.
If getting to that remote island and putting on a spread is part of your plan, don't let me hold you back. I've seen people pack a grill, and coals and serve bacon wrapped shrimp and cobbler in the middle of a five day cruise on something just a bit larger than a Hobie 16. If that's you, all the more power to you.
Again, all of this is something that a land-based camping trip can help you gauge - as long as you stick to the food (and water) you brought.
If you find you brought something that you didn't use, you know what to leave home next time; conversely, if you really forgot something essential, and had to buy it on your shake-down camping trip, better put it on the list.
Happy Cruising.
(Sailing issues related to cruising we should take up over at "Seamanship and Boat Handling").