I've used a few methods for this (being a larger guy who would backpack with smaller individuals). The biggest thing I've learned is that the mental aspect matters as much as the nutrition. Here's the ones I can attest to personally:
I list this first because you don't have to bring it with you! Like acupuncture, the better known of the pressure point techniques, acupressure provides stimulus to nerves to achieve desired results. I've used a point on the back of my knee, slightly off center toward the opposite leg. It's not listed on this resource, but more hunger points can be found here. It doesn't matter if it's real or perceived. Perceived improvement IS real improvement.
More filling food
Calories are the main thing to account for when you're remote for extended periods of time. If you spend time in less-developed areas, you quickly learn the foods that people use to feel fuller than their calorie count would indicate. The added benefit is that they are often cheap and shelf-stable. Things like ramen, oatmeal, grits, and potato flakes fit the bill. These line up better with proper meals than they do with snacking, which is another thing I'd encourage. (Update 1) (Update 2) Easy access to water and fire means you can add weight to this food while also making it hot...
It's amazing how much hot food/drinks matters, especially in the morning. But this is mental more than it is biological. Hot food means control and safety, even if it's hot out. Many people think bringing a granola bar to eat for breakfast will be quick and provide what they need, but I feel much fuller if I eat the equivalent calories of hot oatmeal. (Score another one for oatmeal here.) If you're used to coffee in the morning, bring coffee (or even drink hot water to keep the routine in practice).
You don't have to be diabetic to feel the effect of blood sugar changes. I never intentionally do bushcraft or backpacking without an emergency fun-size packet of M&Ms. Little space, low weight, big impact. 3 hours of fishing with no fish and feeling down? Eat a single M&M, get motivated, and fish for another hour. If your body can't handle the added sugar, bring PLENTY of natural sugars in the form of dried fruits. Just a little at a time, don't spike your blood sugar! (Update 3) Same thing goes for powdered drink mixes. A little mix adds sugar to standard water, while also adding a ton of flavor...
Flavor is mental. If it's possible, opt for pre-flavored options. I've mentioned oatmeal several times, but it provides more mental motivation if it's apple cinnamon oatmeal or has chunks of dried fruit in it. Flavor matters more than texture, but texture variety also happens trick your brain into thinking you've got a ton of options. I dehydrated red pepper strips and toss them in with trail mix. I don't like unsalted nuts, but adding a fresh flavor to them helps balance out the typically sugary or salty trail options. If you bring ramen, only use half the flavor packets; you can use the flavor pockets on hot water to trick your brain into thinking it's food. I bring a packet of dehydrated beef stroganoff (my preferred dehydrated meal) with me when I go backpacking. I save it for the last day, unless there's an unexpectedly rainy or snowy day. The flavor picks up even the lowest of spirits. It's also worth considering that some meals don't taste good cold (e.g. potato flakes), but sometimes you can't heat up your water for dehydrated meals. Learn your wild herbs. Adding wild onions or garlic to blah food goes a long way.
Even if I'm alone, I'll often remark how "this time isn't as bad as that one time." Don't let horror stories get you down. Let them remind you of the gratitude you have for being prepared. If it's your first time missing more than one meal and you have several days to recover before going out, try fasting. Your first night on an empty stomach sucks. Your second night sucks less, not more. Why? You know what's coming. It also helps to separate the deep-seated instinct that hunger correlates to lack of control. Everybody gets the shakes when they fast. The mental-emotional warfare
follows the shakes. Knowing you've gotten through it before makes it so much easier to push that little bit further.
There's no substantive difference in calorie burn between frequent eating and spaced out meals. That said, normalcy is powerful. If you snack normally, snack while out. If you're foraging, snack on it. If you normally eat regular meals, try to eat regular meals. Experience can dictate what works best for you.
Don't grind your own flour from acorns. If you find corn to grind cornmeal, you're no longer separated from civilization. Grinding meal/flour is only advantageous for complete backwoods living. You're better off learning wild edible foraging than rustic milling.
Intake added sugars in moderation. Don't cause blood sugar spikes. Simply compensate when needed, such as when needing focus or energy to get to a known win.