Low calorie fast food

Whenever I  go to McDonald's, I definitely order fillet O fish as it is one of a low calorie option on the menu.McDonald's staff told me that they don't cook in oil. That's why is much less fat. And is tasty as well. I have the table of kcal etc below. Which should prove it.

Total Fat 15 g 23%

Saturated fat 2.8 g 14%

Trans fat regulation 0.1 g 

Cholesterol 32 mg 10%

Sodium 434 mg 18%

Potassium 220 mg 6%

Total Carbohydrate 26 g 8%

Dietary fiber 1.4 g 5%

Sugar 3.7 g 

Protein 11 g 22%

Vitamin C 0% Calcium 12%

Iron 8% Cobalamin 18%

Magnesium 6%