I occasionally have a protein shake after gym session if I am going on somewhere and haven't got something suitable with me. The one they have available at my gym is QNT - it says it's zero fat/low carb. Actual grammes per shake are 0.6g fat and 11.9g carb - so lowish carb rather than v low - but I prefer that it's a low fat version - unlike an Atkins shake for example.