Marathon Training Nutrition

My best advice is just keep your meals to something that you know and don't try new things before a long run.

I never carb loaded or anything like that for my marathons, I always stuck to my normal clean diet.

My main issue was always getting runners gut after eating non clean meals.

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I never carb loaded or anything like that for my marathons, I always stuck to my normal clean diet.

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I agree. I decided to carb load the night before a long run (changed my normal diet). About 4 miles in my stomach began to rumble. I was lucky to find a port-o-let on my route.

Morning of a very long run I'll eat a sweet potato topped with PB. Night before I may eat a PB and banana sandwich.

You seem to be at the beginning of training so just play with it each day of your long run. You just soon start getting used to gels or blocks while running. Every 4-6 miles depending on your sweating and calorie expenditure

I'm running the berlin marathon tomorrow. I didn't change my diet during training, just ate a bit more. I tend to eat relatively healthy, though (lean protein, lots of carbs in general).
I had a big cheeseburger and cheese fries for lunch today, and I'll have some pasta for dinner. Probably not the best, but I'm not too uptight about my diet and prep.

Yea I crushed my run a couple weeks ago. Then the past 2 I really struggled. I think I need to start incorporating some carbs around my long runs.

Haven't really ever trained for a Marathon in particular, but have some experience with nutrition during activity. I'm currently training for a half ironman and have been using nothing but liquid nutrition.

I've done 90 min to 2 hour runs, and with 3 hour bikes followed by 30 minute runs with only liquid calories. Currently using Hammer Perpetuem, but switching this week to Infinit Go-Far when it's delivered. The Perpetuem is known to be a little tough on your stomach with heat and high exertion due to higher protein content. Only cramped up once, but making the switch in case, plus Infinit has very good reviews.

I make a concentrated mix in a single water bottle based however many servings are needed for the time I'll be out there (~1 serving per hour, so 3 or 4 servings usually). It get's really thick/pasty and honestly hard to drink alone. I take little shots followed by water to dilute in my stomach (separate water bottle on the bike, or fountains where I run). In the longest sessions I've had, I never get hungry or bonked and it's much easier than trying to get down gels, shot blocks, waffles, etc..