I started tracking all of my intake on myfitnesspal and was watching my macros closely. I was eating a lot of carbs every day when I first started; 4-500 grams per day. I worked that down to around half of that at peak marathon training (70mpw). I focused on eating high fat/high protein and avoided the simple sugars, processed carbs, etc. I coupled that with running all of my workouts fasted (it was a slow process of doing it on just shorter recovery runs and worked up to doing 20 milers fasted). The fasted runs were running with water only - no carbs taken in during the runs except for dress rehearsal runs where I made sure my stomach could still handle the sudden surge of carbs.
My previous races were always with a gel every 5mi, but after changing my diet and training fasted I cut that back to 2 gels in a marathon instead of 5. It's still a lifestyle for me, but I don't track any more. I'm probably eating more carbs than back in 2014 when I was really into it, but I am still mindful of that balance.
ETA: I stopped carb loading pre-race also. I'm a firm disbeliever in it.
Can you list some examples of types of foods you would eat to be able to sustain your nutrition? I'm probably on a heavy carb and lean protein diet for the most part - lots of pasta, chicken, potatoes, lean red meats, fruits, veggies, etc. Has definitely helped it out, but would like to get even healthier.
I'm far from a perfect eater, but I do try hard most times. I used to get mad about letting myself slip up with junk, but I've learned over time to just let it go. It's not worth the stress of eating chick fil a every once in a while. Spicy chicken sandwich
Most of my protein sources are eggs, chicken, venison, and just about any fish (I
love salmon). I don't intentionally avoid beef - it's just that I enjoy my deer hunting and usually have a chest freezer full of it
. It helps that venison is healthier. I'll eat a steak or a burger if that's what's for dinner. Hell I ran my HM PR on a burger/fries the night before thx to
@comfortably numb 
I completely avoid pastas and most breads - I'll have an english muffin or a wrap, but that's about it. Otherwise I just try to be sensible with my carb sources - potatoes, rice etc are all fair game.
A typical day:
Breakfast = 2-3 eggs in various forms (all kinds of omelettes and wraps). I'll have sausage (pork) with a wrap or sometimes a English muffin sandwich.
Lunch = grilled chicken and cheese wrap with mustard and tons of spinach (huge fan of spinach)..... greek yogurt, blueberries (try to eat them every day), banana, etc. I'll eat chips to satisfy that vice from time to time (weakness).
Dinner = whatever my wife cooks, I eat. It's usually venison or chicken based with rice and veggies as the sides. Try to eat spinach salads when we can, but we're not as good about that as I'd like (it gets boring really quick).
Snacks = I'm a chocolate fiend - my go to is
almond bark thins. If a doctor tells me I can't have these, I'll throat punch'em.
Almonds, cashews, peanuts, etc - I think nuts are great. Apples dipped in natural peanutbutter is friggin heaven. Veggies in hummus. Just a few off the top of my head.
I know I've posted it way back when, but I think it's so damn hard to eat clean and get enough calories in for runners. You almost have to cheat to get properly fueled.
