Your Post-Workout Protein Shake ISN’T Doing What You Think It Is
Have you ever reached for a protein shake post-workout? If you have, I completely understand why. Pre-made protein shakes or powders are marketed as ‘recovery drinks’; however, they are usually low on one key nutrient which is paramount for adequate recovery…
I'm not here to tell you to never have protein shakes again. But I am here to tell you that if recovery is your goal - if you want to feel good for your next session, reduce soreness, and adapt to your training - then a high-protein shake on its own may not be an effective thing to reach for.
Let's talk about why:
What Your Body Actually Needs After Training
When you finish exercise, your body has three primary recovery jobs to get on with:
Replenish glycogen - the stored carbohydrate your muscles ran down during exercise
Kickstart muscle protein synthesis - the process of repairing and rebuilding muscle tissue
Rehydrate - replace fluids and electrolytes lost during exercise
They all matter. But here's the thing, these protein shakes and supplements unfortunately miss prioritising carbohydrates, a critical piece of the recovery masterplan.
This is because glycogen (carb) resynthesis - muscles restoring their fuel stores after exercise - is time-sensitive in a way that protein synthesis isn't. The enzyme responsible for carb storage (glycogen synthase) is most active immediately post-exercise and declines significantly if you delay carbohydrate intake. Miss that window, and your muscles replenish glycogen more slowly, meaning you may go into your next session under-fuelled.
It's also worth being clear: this isn't an argument against protein. Guidelines (Thomas et al., 2016) suggest that combining protein with carbohydrates after exercise can further support glycogen resynthesis, particularly when carbohydrate intake is low (0.8g/kilogram body weight post-exercise). With regards to muscle building, meeting your total protein requirements for the day is more important than protein timing post-exercise. The point isn't to ditch protein, it's that the obsession with protein alone, at the expense of carbohydrates, is where most people are going wrong. Both matter, and getting enough of each is what real recovery looks like.
The Numbers: What the Research Actually Says
Sports nutrition guidelines (Thomas et al., 2016) are pretty clear on post-exercise recovery targets:
Carbohydrates: 1–1.2g per kg of body weight in the first hour post-exercise
Protein: 0.3–0.4g per kg of body weight (alongside those carbs)
That's a roughly 3:1 carbohydrate-to-protein ratio.
For a 70kg person, that works out to approximately 70–84g of carbohydrate and around 21–28g of protein. Now let's see how your favourite post-workout shake stacks up:
Let's Look at What's Actually in These Shakes
I pulled the nutritional information from some of the most popular protein and recovery shakes currently on the market. The pattern speaks for itself.
Across the board, these drinks contain around 25–50g of protein, but only 13–25g of carbohydrates. Not one of them comes close to the recommended 3:1 recovery ratio.
For most people, that means you'd need to drink multiple servings to meet your actual post-exercise needs.
The pattern is consistent: lots of protein, not enough carbs. Unfortunately, these products are not designed with the science in mind.
So What Should You Be Reaching For?
Here's the plot twist that nobody in the supplement industry wants you to know: chocolate milk is one of the most evidence-backed post-exercise recovery drinks available.
And yes, I mean the bog-standard, very cheap, chocolate flavoured milk.
A 500ml serving of semi-skimmed chocolate flavoured milk delivers approximately:
70g carbohydrates
18g protein
That ratio sits much closer to the recommended 3:1 target. It's cheap, accessible, and research backing it (Amiri et al., 2018).
Not a chocolate milk fan? Other options include:
A banana and a large glass of milk (or soya milk or oat milk fortified with protein)
Rice cakes or toast with nut butter
A smoothie with fruit, oats, Greek yoghurt, and milk
A meal - a balanced plate of carbs and protein covers everything
None of these require a subscription, a shaker bottle, or a £3.50 spend at the gym counter.
BUT if you do still want the protein shake, there is no issue with you having it WITH an additional banana, cereal bar, piece of toast, or other extra carb source to meet your recovery needs.
The Bottom Line
Your muscles need both carbohydrates, protein, and hydration to recover. But in the immediate post-exercise window, carbohydrates are the limiting factor, and most protein shakes don't deliver enough.
If you're serious about recovering well, performing consistently, and feeling good between sessions, you can do this with simple, cheap, nutrition.
If you want support building a nutrition approach that actually works for your training, I’d love to help. Book using the link above.
REFERENCES
Amiri, M., Ghiasvand, R., Kaviani, M., Forbes, S.C., & Salehi-Abargouei, A. (2019). Chocolate milk for recovery from exercise: a systematic review and meta-analysis of controlled clinical trials. European Journal of Clinical Nutrition, 73(6), 835–845.
Thomas, D.T., Erdman, K.A., & Burke, L.M. (2016). American College of Sports Medicine Joint Position Statement: Nutrition and Athletic Performance. Medicine & Science in Sports & Exercise, 48(3), 543–568.