If you're really struggling to add enough cals to your diet to gain you'd be better off adding ridiculous amounts of fish oil pills, add extra virgin olive oil to your shakes or even with every meal, hell even loads of peanut butter would be a better choice. Downing a few tablespoons of EVOO is easy and a ton healthier than the garbage they put in McDonalds food. There are plenty of ways to add ridiculous amounts of cals to your diet without eating the shit they put in McDonalds food.