Low cholesterol diet

I am supposed to lower my cholesterol and looking for food to eat. I have zero idea what I’m doing. I normally eat once a day, and it’s usually fast food. Anyway, I was thinking of chicken, and maybe spinach for lunches. My question is, is it better to eat it like a salad,
Or better to cook the spinach? Does it lose any nutritional value, vs not cooking it?

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