Hereâs a delicious and easy way to make a good supper with salmon. Celeriac is a great swap for potato, with half the calories. Each serving provides 400 kcal, 33g protein, 11g carbohydrates (of which 9g sugars), 22g fat (of which 4g saturates), 14g fibre and 1.1g salt. With a GI of 45 this meal is high protein, low GI.