The second one you eat per week.
While fast food is never optimal, what makes it particularly bad is the frequency. If you
have fast food once every couple of weeks you are generally fine. Eat the most salty,
greasy, sugary thing you can get your hands on and enjoy: it will not damage you. That
is fine.
The problem with fast food arises when you have it weekly or multiple times a week.
That is when things get really sketchy, because you eat fatty, greasy, salty, sugary fast
food multiple times a week instead of eating nutritionally solid, rich and varied food. You
can afford a nutritionally poor and too calorific meal once or twice a month, sate your
craving if you are a fan.
What you can't afford is eating like that too often. So what makes fast food unhealthy is
the number of times you have it, not the intrinsic properties of one meal.
Full story:
https://www.quora.com/What-is-the-healthiest-fast-food-option-in-the-US? no_redirect=1
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