Protein powder itself does not inherently make you fat. However, consuming too many calories, including those from protein powder, can lead to weight gain.
Protein powder can be a useful supplement for increasing your protein intake, but it is not a magic solution for weight loss. To avoid weight gain, it's important to follow a balanced and calorie-controlled diet and to engage in regular physical activity. Additionally, consuming more protein than your body needs can result in the excess calories being stored as fat.
It's also important to keep in mind that some protein powders may contain added sugars or other ingredients that can contribute to weight gain. When choosing a protein powder, it's a good idea to look for a product that is low in sugar and other calorie-dense ingredients, and to follow the recommended serving size to avoid overconsumption.
If you are trying to lose weight, it's a good idea to work with a healthcare professional or a registered dietitian to determine an appropriate calorie intake for your needs and to develop a personalized nutrition and physical activity plan that will support your weight loss goals.