Milk after training beat Greek yogurt on bone markers
In short
In a randomised crossover study, 20 participants completed a session combining plyometrics, resistance exercise and high-intensity interval cycling, then took milk, Greek yogurt, a carbohydrate drink or water. At 24 hours, the bone formation marker P1NP was significantly higher with milk than with water (p=0.039), and RANKL — the signal that recruits bone-resorbing cells — was lower with milk than with all three other trials (p<0.05). Two dairy foods with different matrices did not behave the same, so milk has the better evidence when post-exercise bone remodelling is what you are after.
That exercise and dairy each support bone is old news. What is new is which dairy. This study started from the premise that milk and Greek yogurt, despite both being dairy, have different food matrices and might therefore move post-exercise bone markers differently. They did.
How was it tested?
Participants were 20 people naive to resistance training (8 male, 12 female; age 22.7±4.0; BMI 22.0±2.3), each of whom went through all four conditions in a randomised crossover design. The exercise was a single multimodal session combining plyometrics, resistance exercises and high-intensity interval cycling.
- Four supplement conditions: milk, Greek yogurt, carbohydrate, water.
- Timing: immediately post-exercise, at 1 hour and at 12 hours.
- Blood draws: pre-exercise, immediately post, 1 h, 4 h and 24 h.
- Measured: P1NP (formation), CTX (resorption), parathyroid hormone, RANKL, and the OPG:RANKL ratio.
What was different at 24 hours?
Two findings carry the paper. P1NP — reflecting new collagen being laid down in bone — was higher with milk than with water at 24 hours (p=0.039). And RANKL, the signal that recruits bone-resorbing osteoclasts, was lower with milk than with every other trial (p<0.05).
In other words, the building signal went up and the demolition signal went down under milk. Trial-by-time interactions appeared for P1NP, CTX, parathyroid hormone, RANKL and the OPG:RANKL ratio, and P1NP additionally differed by sex.
Why didn't Greek yogurt match milk?
That was the hypothesis the researchers set out to test. Milk and Greek yogurt both carry protein and calcium, but their dairy matrices differ — liquid versus semi-solid, a different whey-to-casein ratio, a different absorption profile alongside the water they carry. Those differences showed up in circulating markers a day later. A view that only counts total grams of protein does not explain it.
The carbohydrate condition is worth noting too: it did not produce milk's effect. Building your post-training drink around carbohydrate can cover the muscle side while leaving the bone markers where they were. None of this contradicts protein timing versus total intake — what separated these conditions was not timing but what was eaten.
What it means for lifters
Your Muscle Index comes from squat, bench press and deadlift 1RMs, and bone density is not in it. But bone is the platform that lets you keep loading those lifts. That training itself stimulates bone is covered in strength training and bone density and the training dose for bone density; this study adds that what you eat after that stimulus can shift the recovery signal.
The practical version is simple: hit your post-training protein, and make one of those servings milk. Read it alongside the whey dose plateau at 30 grams for the full picture. If bone density is already low, osteoporosis reversed by loading comes first.
What was measured is circulating bone status indicators, not bone density, over a 24-hour window, in 20 participants new to resistance training. This is not proof that milk builds stronger bone over years — and it does not apply if you are lactose intolerant.
Frequently asked questions
Does drinking milk after exercise help your bones?
At the level of acute markers, this trial says yes. Twenty-four hours after exercise, the bone formation marker P1NP was higher with milk than with water (p=0.039), and RANKL, which drives bone resorption, was lower with milk than with Greek yogurt, a carbohydrate drink or water (p<0.05).
Milk or Greek yogurt — which is better after training?
Milk, in this study. Both are dairy, but their matrices differ and so does their absorption, and milk came out more favourable on both P1NP and RANKL at 24 hours. Matching total protein grams did not make them equivalent.
Is a carbohydrate drink enough after training?
The carbohydrate condition did not reproduce milk's effect on bone markers. That is separate from carbohydrate's role in muscle recovery, so if bone is also a concern, adding one dairy-based protein serving is the better bet.
When and how often was the milk given?
Supplements were provided three times: immediately after exercise, at 1 hour and at 12 hours. Blood was drawn pre-exercise and at immediately post, 1 h, 4 h and 24 h, and the clear differences appeared at the 24-hour point.
Does this mean milk increases bone density?
Not yet. What was measured is circulating bone status indicators, not density, over 24 hours in 20 participants naive to resistance training. It suggests the acute response can be steered favourably, not that long-term density improves.
Source: PubMed