How To Carb Load Before A Marathon - FULL GUIDE!

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Published 2022-08-28
Check out my carb loading guide which you can download here:
👉 www.nutritiontriathlon.com/carb-loading-plan?utm_s…

Let's talk marathon carb loading

If you want to run a marathon as fast as possible then you should definitely carb load. We know that carb loading can improve your performance in a marathon by 2-3%, which is really quite significant!

So if you're running something like the London Marathon or the New York Marathon (or really, any marathon for that matter) then you should definitely carb load. But it isn't quite as simple as saying just eat more carbs so in this video I run through everything that you need to know to be able to carbohydrate load properly.

Get your nutrition for a marathon right and you'll be off to a flying start. I'm also going to be doing videos on marathon breakfasts and a complete marathon nutrition guide, so make sure you subscribe to stay up to date with my nutrition tips for a marathon.


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00:00 Introduction
00:52 What carb loading ISN'T
01:32 Why carb loading is useful
02:45 How much to eat
03:34 What type of carbs
04:53 How long do you need to carb load for?
06:02 Hydration
07:06 Is carb loading unhealthy?
07:52 Extra tips!

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Hi! I'm James. I'm a Sport and Exercise Nutritionist and I make videos on nutrition to give people simple, clear and easy to use information on a range of subjects. I focus on triathlon and how triathletes can use nutrition to help properly fuel their training and racing.

In my day job I work as an Advanced Clinical Practitioner in General Practice, or Family Medicine for those of you not in the UK, and work in a busy NHS GP practice. I'm a Specialist Paramedic by background and have full independent medicine prescribing rights.

Advanced Clinical Practitioner in Family Medicine, BSc, PGCert
Registered sport and exercise Nutritionist (SENr)
Advanced Diploma of Nutrition, MSc Sport and Exercise Nutrition
Nutrition Consultant for Hurry The Food Up
Great Britain Age Group Triathlete
Qualified L2 British Triathlon Coach

I am not affiliated or sponsored by any brands, companies or products that I mentioned or show in my videos. My aim is to make these videos free from any sort of bias!

These videos shouldn't be taken as direct, personal advice on medicine or nutrition but more for information purposes based on the latest research and evidence. Unless otherwise clearly stated, this information is more suited to adults as under 18s have different requirements and considerations. I'm happy to answer any questions you might have as an individual though!

Contact: James@nutritiontriathlon.

All Comments (21)
  • @jakubtokarz8467
    To clarify what you mentioned about water binding: As you increase carbohydrate intake, your body converts glucose into glycogen and stores it in the liver and muscles. Glycogen binds water in a ratio of approximately 1 gram of glycogen to 3-4 grams of water. To accommodate this increased glycogen storage, your body requires more water, leading to an increase in thirst. Consuming more carbohydrates raises blood glucose levels. High blood glucose levels can in some cases lead to osmotic diuresis, where glucose is excreted in the urine, pulling water along with it. This can result in dehydration and increased thirst as the body tries to maintain fluid balance. An increase in carbohydrate intake stimulates insulin production to help transport glucose into cells. Insulin also influences sodium balance in the kidneys, which can affect fluid retention. The body osmoreceptors detect changes in blood osmolarity. High carbohydrate intake can increase the osmolarity of the blood, triggering the osmoreceptors to signal the brain to increase water intake, leading to a feeling of thirst.
  • @daniels3642
    This is wonderful. I'm carbloading for my first Marathon tomorrow. 💪
  • @zb5715
    Your content has been a wealth of knowledge for me lately. Thanks a million!
  • - Eating a big and specific load of carbs before your race - 2-3% better run - 10 grams of carbs per kg bodyweight - Sweets and sodas are GOOD (as an exception) - Minimum 24h before the race - Normally from 36 to 48h before race - 3,5L of water and electrolytes - 1 Gram of glycogen= 3 grams of water - Eat more in the morning - Carbi drinks are a cheat code - Practice in advance the carb load
  • @kypdur4746
    This is invaluable information, but I'd suggest that the percentage could be higher than 2-3% improvement, if you carb load properly. I ran 4 marathon with a best of 4:28. Hit the wall every time, due to pure ignorance about carb loading. Pre marathon 5, carb loaded at approx 7g per kg for 3 days. Ran 4:01. No difference in pace, hillier course, just could sustain the pace until the end. By marathon 7, was down to 3:42. Brilliant video!
  • @monkeyslaye
    Hey man, thanks a bunch for the informative video. I downloaded your carb loading plan and I plan to follow it shortly as I have a half marathon that looking to push a PR on.
  • @ordinarypablo
    will implement this for my bjj tournament which is tomorrow
  • @todor7151
    Thanks for the great vid! It was really helpful as I am going to run my first marathon next week. The only thing that concerns me a bit with carb loading is I feel like I would be holding too much water and feeling bloated.
  • @utube7917
    Water is needed to move the glucose into adipose tissue (fat cell). Also, if you are on a ketogenic diet, you will fell 10x more amazing when in ketosis. You can carb load on a "carb day" and fill your glycogen stores in 24 hrs and you will still be back in ketosis in the morning for most people. The advantage is that you can use MCTs for immediate massive energy in the morning and still have glycogen inside the muscle itself. More fuel options allows for more energy than just a maxed out glycogen tank. A not about ketogenic diets is it takes a minimum of 30bdays to adapt and allow your body the time to ramp up enzyme production. If you are strict for several months, you can optimize and be even more efficient. People do this for uktra narathons in the mountains.
  • @dew_reg1574
    I will implement this plan for my next marathon. Thanks !
  • @BishopTsabo
    One of the best videos un this topic. Thanks!
  • @Lukemplant
    Marathon on Sunday, it’s Friday so I’ll get to it tonight and tomorrow
  • @rlobo8329
    doing this for my first marathon!
  • Fantastic video! Running my first half marathon next Sunday! How many days in advance of the race should I start carb loading? Thanks so much!