Bye bye Valentine’s Day, hello St. Patrick’s Day! McDonald’s has brought back their famous Shamrock Shake! The Shamrock Shake is not exactly keto friendly… a large has 820 calories and 113 grams of sugar – but all good things have a price! The minty milkshake will be available until March 24th, but not all locations have it! McDonald’s wants you to download their app to find the closest location to you that carries it.