For the last 1600 miles of my hike, I was covering about 30 miles a day (including days off). This meant that a standard hiking day was usually in the mid 30s. What did I eat? A lot. Here is a sample days food. Since I didn't send myself maildrops, I tended to eat a large variety of food. So, the food below only represents what I may have been eating around Lassen, but not around Shasta.
Breakfast - 2 sleaves of poptarts or 2 Breakfast squares or 4 fruit and grain bars, etc. I didn't cook in the mornings.
I would generally eat most of my food while hiking. During the day I would tend to consume: 3 regular snickers bars or 2 king sized ones, 2 packets of "Golden Toast Flavor Crackers" (crackers with cheese, Jalapeno Dorritos are the best), 2 packets of nuts (hot peanuts are the best. I don't know the size, but they have 350 cals per packet), 1/2 quart bag of snack mix (i.e, Ritz snack mix, Snak' Ins, etc), 1 bag of Craisins.
During one or two of my breaks, I would tend to consume something not convenient for eating while walking. For example, 1/4 lb of cheese during one break and 1/4 lb of hard salami on another. Or cheese on one break and two nutella (or peanut butter or hummus) burritos.
I would cook 1 meal a day, usually between noon and 5, and would then hike on. A typical meal would consist of 2 Ramen (eating light) or 2 Lipton Rice (or Pasta) and Sauce or 1 packet stuffing or 2 packets instant, flavored potatoes or 2 boxes of couscous or 1-2 boxes of mac and cheese or 1/2 lb pasta with a Knorr sauce packet I'd add around 1/4 cup of olive oil to whatever I cooked, including the ramen.
When I stopped for the day, I would tend to have desert while writing in my journal. This was usually 2 Mrs Field's cookies. They are individually wrapped and far superior to Grandma's cookies. Pepperidge farm softbaked cookies are quite excellent as well. Or, 1 row of double stuffed Oreos.
All this adds up to a fair amount of food weight and definitely more than a hiker doing 15 miles a day in the summer on the AT. I needed it, however. Except for one stretch coming out of Yosemite when I mis-estimated the amount of food I would need, I was never hungry. That's right, never. I have very few food cravings during the trip and did not become emaciated. I did lose about 20 lbs of fat. No muscle loss.