Quick answer: A low-calorie protein powder delivers high protein (20g+) for minimal calories (around 100-120 per serving), usually via whey isolate or a lean plant blend with little added sugar or fat. It is ideal for staying full in a calorie deficit.
What counts as low-calorie
Look for ~100-120 calories per 20-25g protein serving, low sugar and low fat. Whey isolate and clear whey tend to be leanest; check the label per serving, not per 100g.
How to use it for weight loss
Use it to add protein and fullness without many calories, a shake as a snack or light breakfast. See protein powder for weight loss UK.
Watch the add-ins
Mixing with full-fat milk, banana and nut butter adds calories fast. For the lowest-calorie option, use water or a light plant milk.
Frequently asked questions
What is a low-calorie protein powder?
One that delivers 20g+ protein for around 100-120 calories per serving, typically whey isolate or a lean plant blend with minimal sugar and fat.
Is low-calorie protein good for weight loss?
Yes, it boosts protein and fullness with few calories, helping you stay in a deficit while protecting muscle.
How do I keep my protein shake low-calorie?
Mix with water or a light plant milk and skip high-calorie add-ins like nut butter and full-fat milk.
Related reading
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This article is general information, not medical advice. If you are pregnant, breastfeeding, or have a health condition, check with your GP or a registered dietitian before changing your protein intake or supplements.