McDonald's (Canada) Filet-O-Fish Sandwich nutrition facts

One serving of McDonald's (Canada) Filet-O-Fish Sandwich (1 sandwich) has 400 calories, which works out to 288 calories per 100 g. That is about 20% of a 2,000-calorie day.

It provides a solid 14 g of protein per serving (28% of the 50 g daily value), but protein supplies only 14% of its calories, so it is not a protein-dense food. Foods where protein provides 30% or more of calories are generally considered protein-dense.

It is hard to fit into a strict keto diet. One serving has 39 g of net carbs and 40% of its calories come from carbohydrates, while most keto plans cap net carbs at 20–50 g per day.

590 mg per serving, which is high (20% or more of the 2,300 mg daily value).

5 g of total sugars per serving. Labels list total sugars, which include natural sugars from fruit and milk as well as any added sugars.