It Was a Protein Shake When You Started

Current research puts optimal protein intake for active adults at 1.6 to 2.2 grams per kilogram of body weight per day — roughly 0.73 to 1.0 grams per pound for someone actively training. A good working number: 1 gram of protein per pound of body weight daily. Several well-designed studies land in the same place, and it's a round number that's easy to track.

Sounds simple enough. And it is — until it isn't.

There's a circulating idea that protein can't make you fat. The logic goes: protein has a higher thermic effect than carbs or fat, meaning your body burns more calories just digesting it. That part is true. What people hear, though, is a blanket permission slip. I'm eating protein. I can't gain weight. That's not what the research says.

And nowhere does this get more misapplied than in the protein shake.

Here's how it usually goes. Someone reads the numbers, decides they're going to hit their protein target, and goes and buys a big tub of powder. They get home, dump a scoop into the blender with some water, take a sip — and realize protein powder doesn't taste particularly good. So they swap the water for milk. Better. A lot better, actually. But day after day of the same thing gets old fast.

Then comes the Hershey's.

A squeeze of chocolate syrup fixes the taste problem. For a while. Then the strawberries and banana start sounding like a healthier move — and honestly, they are. Better than the syrup, no question. But here's what those healthy additions just did to the shake: roughly 150 calories (about 630 kilojoules) and 40 grams of carbohydrates, before we even count the milk.

Not unknowingly. Unthinkingly.

Because in their mind, it's still a protein shake. And protein shakes can't make you fat.

What they've actually built is an expensive milkshake. Arguably better for you than the one sold under a giant golden M down the street — but a milkshake nonetheless. The protein is still in there somewhere. It's just now sharing space with enough sugar and carbohydrates to undo a significant chunk of the work that prompted the shake in the first place.

The calories don't disappear because you mixed them into a protein shake. They show up exactly where extra calories always show up when you eat more than you burn.

And that's before we even get into what's printed on the ingredient label of the powder itself — the stabilizers, artificial sweeteners, gums, and compounds most people can't pronounce. That's a separate conversation, and it's coming. But the point for now is simpler than that.

You bought protein. Then you built a dessert around it.