Good vid, I have been doing this for decades, before this guy was born
Yes, eat a high caloric breakfast and snack throughout the day. Eating an actual lunch will take blood to digest and can make you tired as the blood is used for digestion. I try to snack every hour with water, keep the fire fueled.
Weight is ok but the volume of those FD meals can be cut in half if you roll your own or cut them open and use a zip lock Vs still foil. Light is right but also is the volume of what you are packing.
Good advice on sugars, you want fat and protein.
I forget to mention rocket fuel, chocolate covered coffee beans. I have some in a pocket and snack on when needed, like 2000 foot of scree or end of the day going back to camp. I also throw in a few almond M&M, quick burn sugar to amp up, fat and protein of the almonds for the long burn.
Logan bread. high fat, high protein, dense calories. Experiment to get that flavor mix you prefer.
The best way to get the most from caffeine; stop all caffeine intake at least 14 days from your hunt, decrease it over another week or longer. Now on the hunt, a short cup of coffee will zoom your body, then use rocket fuel over day or a shake down and brew up a cup, I never leave camp without my stove.
Greg mentioned altitude and cooking. To save fuel, I let a lot of food simmer after the boil to rehydrate it. Save fuel.
This is all an experiment with time in the hills.