Whey protein for weight loss: what it does and does not do

Does whey protein help you lose weight?

Not on its own. The finding in the literature is about protein intake, not one powder. Phillips, Chevalier and Leidy reviewed the research and reported that higher protein diets improve fullness and lead to greater reductions in body weight and fat mass than standard protein diets. Whey is simply an easy, low fuss way to add protein.

How much protein should you eat on a cut?

For people who lift, the ISSN position is that 2.3 to 3.1 g of protein per kg of bodyweight per day may be needed to maximize retention of lean mass during periods of eating less. A systematic review by Helms and colleagues of lean, resistance trained athletes reached a similar range, 2.3 to 3.1 g per kg, but expressed it per kg of fat free mass, and said it likely scales upward with the severity of the calorie cut and with leanness.

Those two ways of counting give different numbers for the same person, so treat the range as a guide and not an exact target. If you want a coach to set it with you, coaching at UnReal includes nutrition and macro guidance.

Does whey protect muscle while you diet?

The protection comes from enough protein plus continued lifting, not from a particular brand. The same review reports that higher protein diets improve fullness, which may make a calorie deficit easier to stick to.

Which whey would we pick for a cut?

We look at two things: how much a 25 g serving of protein costs, and whether lactose bothers you. Isolate is the lower lactose option. The table below ranks what is on our shelf today by cost per 25 g of protein, and the pick above it applies the same rule to isolates. It changes when the shelf does. Delivery is free within Bangkok only.