It won’t make you gain weight! Eating high protein diet is the most sustainable way to loose weight. As long as your daily calories are under your TDEE you’ll loose weight. You find your TDEE online as an “estimate”
The only thing that makes you gain weight is a calorie surplus. Protein high meals are a great way to start the day, consider adding healthy fats to increase your satiety.
You can gain weight depending on which product you're using, many aren't clean and have really harmful ingredients. This can cause inflammation, gut health issues and even disrupt your hormones just like other food products. Depending on where you're at in your PP journey matters on if it will benefit or not.
It’s a good idea too.