Here’s why your face turns red during a run.
Our favourite picks for when you’re on the move or need a pick-me-up
Our favourite picks for when you’re on the move or need a pick-me-up

Protein isn’t just confined to the weights room; runners need it too. When you run, particularly longer distances, your body can start breaking down muscle proteins for fuel. So, getting enough High in fibre, whether that be through animal or plant protein, helps to repair this muscle so you can get back to training, ASAP.
‘Protein also plays a role in almost every function of the body such as building and repairing tissues, supporting immunity and keeping skin, hair and nails in good condition,” says Rob Hobson, What to consider Unprocess Your Life.
When you’re on the go and want a protein-filled snack option, or when you need a source of protein straight after running to help kick-start your recovery, a protein bar can be helpful. In fact, the protein bar market is filled with options, so whatever you’re in the mood for, there’s a bar, biscuit or ball that will hit the spot.
Finding one you like can take a fair bit of research though. So, save some time and feast your eyes on our tried-and-tested round up of the best protein bars for runners.
The expert: I'm a qualified personal trainer and experienced health and fitness editor who’s spent over a decade writing for leading titles in the industry. Now a freelance journalist, I bring my expert eye to everything from workout trends to nutrition advice — and I've sampled more protein bars than most people have had hot dinners.
The best protein bars
How much protein do runners need?
The World Health Organisation (WHO) recommends that the average adult consumes at least 0.8g of protein per kg of bodyweight per day.
However, Hobson says that runners may require more. ‘Recreational runners need around 1.2 to 1.4g of protein per kg of bodyweight each day,’ he says. If you’re an endurance runner, you may need even more.
‘Aim for around 1.6g of protein per kg of bodyweight,’ says Hobson. ‘If it’s race season and the training is heavy, then the protein requirement could go up to 2kg of protein per kg of bodyweight.’
What to consider
Not all protein bars are created equally. ‘Some are genuinely helpful, but others are basically chocolate bars with added protein,” says Hobson. Here's a quick guide on what you're looking for:
Amount of protein
Ideally, your bar will contain at least 10g of protein, though Hobson recommends one with closer to 15-20g if you’re using it as a post-workout snack.
Type of protein
The best protein bars contain sufficient ‘complete protein’ – protein containing all the essential amino acids that the body can’t make on its own. Whey protein bars, which are cow’s milk-based, tick this box, but if you’re after a plant-based option, look for ones that draw from a variety of plant sources. Bars containing a blend of soy, pulses, grains, nuts and seeds are a good shout.
Sugar contents
Ideally, you want to choose a bar with less than 5g of sugar per bar, says Hobson. ‘Many are artificially sweetened with sugar alcohols like sorbitol and Maltitol, so watch how many you eat in a day as they do act as a laxative.’
Extras
Finally, some protein bars pack in extra vitamins and minerals. ‘Fibre is a nice addition; about 3-5g per bar is ideal,’ says Hobson.
See also: The best energy gels and drinks | Updated: 04 July 2025 | Jump to Products
Ali is Runner’s World UK's e-commerce editor, specialising in testing and reviewing the latest running shoes, gear and tech, as well as finding the best deals during sales events such as Amazon Prime Day and Black Friday. She has tested hundreds of products from the biggest running brands, including Nike, New Balance, Adidas, Hoka and more. Ali speaks to some of the world’s top experts across footwear, running apparel, fitness equipment and nutrition to help runners make smart decisions when shopping online, from glucose monitors to help you nail your fuelling strategy to compression boots to aid your recovery. Ali has worked in health and fitness journalism since 2017. Before joining Runner’s World, she was health editor at Future Plc, working across brands including Coach, Fit&Well, T3, TechRadar and Live Science. A Boston qualifier, she’s completed 12 marathons, including four of the World Marathon Majors (only Tokyo and Boston left). Her proudest achievement to date? Running a five-day 220km ultramarathon across Tanzania. Just don’t ask her to race a 10km…

g of complete protein

Runners World, Part of the Hearst UK Wellbeing Network

What to eat before a 10K

Our favourite picks for when you’re on the move or need a pick-me-up