I need to figure out a few different fueling strategies to try in the next few weeks. I know there are a lot of posts about the is, but a lot of them are also kind of spread out and buried in pretty long threads. I want something simple....like ONE thing to use so I don’t have to think too hard. I have 4 long runs to try stuff out on, and a couple of mid-week 6ish mile runs to try stuff with caffeine. My hydration vest holds up to 1.8L, so I’ll probably have around 1.5L of water in it to start the race and I have been running with it at least half full for a month to get used to the feel/weight.
From a timing perspective, it looks like around the 1 hour mark seems to be a common recommendation for a starting point (which will likely be somewhere between mile 5 and 6.) And then something every ___mi or minutes? The local running store has individual packets of a few different kinds of tailwind, gu, and some other stuff I can’t recall off the top of my head.
I can say that I don’t like to work out on an empty stomach, but also that I don’t like to eat and then immediately work out...I usually give myself at least an hour after eating before I do any kind of bouncy/running type exercise, so I’m hesitant on the actual food/chew it up items. Plus it’s “just” a half.
So a few things:
-Research shows that while you're unlikely to reach glycogen depletion in a half marathon, that performance in events longer than 90 min show noticeable differences when intaking carbs. Even more so with carb loading than in-race nutrition.
-If you take a single sourced carb (like Sports Beans), then the limit of consumption is 60g of carbs per hour.
-If you take a multi sourced carb (like GU Chocolate Outrage which contains both Maltodrextin and Fructose), then the limit of consumption is 90g of carbs per hour, or approximately 4 gels).
-If the race temps are above 90F, then limit yourself to 50g of carbs per hour.
*These are all maximums and you can certainly do less. I prefer to find my maximum tolerance, then find my minimum before the carbs become a reason for decreased performance.
-Almost all carb sources need 1 oz of water for every 2g carb consumed. So if you eat a single GU pack with 21 g carbs, then your body will need 10.5 oz of water minimally to be able to absorb it. Otherwise, your body will steal water from your muscles in order to digest. This commonly creates gut issues and feelings of dehydration.
-Maurten gels require no liquid intake.
-Maurten 320 is 4g carbs per 1 oz water unlike most all other sources at 2:1.
-Consider the possibility of electrolyte replacement as well. Some gels have a high content of sodium and potassium. Others do not. Some have one or the other.
-Timing wise I prefer to start right before the race begins and throughout the entire event. The closer you get to the end of the event, the harder you'll be working and the less ability you'll have to easily digest things you intake. So I recommend starting earlier than later, because it's easier to intake at the beginning.
My go to recommendation for a single use, easy to remember item, are Egels.
https://www.cranksports.com/
They are multi sourced (Maltodrextin and Fructose) and they contain a higher content of sodium/potassium than most other products. The main drawback is their general size is 1.5x most other gels. So you get 150 calories or 37g carbs per packet whereas most others are 100 calories and 20ish g carbs. So the packet is larger. Since they are 37g a piece, I would recommend no more than 2 per hour. I would eat one within 15 min of starting, and then every 30-45 min after that. My breakthrough marathon in 2015 I consumed 7 gels in a 3:38hr event. Once inside 30 min of finishing, you don't really need anything. You can swish carbs from a liquid source and spit it out if desired, but your body won't absorb anything fast enough within 30 min for it to matter.
If you want a single liquid item to use, then I would go with Tailwind. It's cheap, has the ability to dilute/concentrate (although this does not change the need for 2:1 water to carbs), and contains a decent amount of sodium/potassium. If you want to use concentrated Tailwind, then my go to super concentrate is stored in this hammer nutrition bottle which is fairly small.
https://thefeed.com/products/hammer...TzQeEEug2i17GUwMD8n3TWWI7fquHlF0aAorNEALw_wcB