I hear arguments like yours all the time but they're never backed up with actual data. It's just generic fast food bashing. Many fast food places have healthy choices along side unhealthy choices. The options are there.
Everyones genetics allow them to eat differently. If McDonalds is healthy and working for you, great. If you want to try something different, figure out where the meat and vegetables are coming from before you put it in your mouth. Might seem extreme, but actually its logical.
Also, my point wasn't the lack of healthy options at a fast food joint (ironic), but is that generally people don't go there to eat healthy. Remember, you are what you eat. Even the most in shape people know there is no such thing as exercising yourself into shape without a good diet.
Side note: I live in a world where processed foods are the devil and pretty cook and subsist off of 1 meal per day. I am the extreme. But I used to be on the opposite side of the spectrum, picking a fast food place daily for lunch and stuff. Lost over 50lbs and bf under 15 for the first time in my life. I went from almost diabetic to completely healthy, "with a strong heart".
Also, a shout out to fatburningman.com because that site will teach you some honest fitness, life and health skills.
Which is, at best, half-true. Health can only be determined as fitness for purpose and it's possible that a McDonald's meal is fit for a certain purpose. Nothing magically makes McDonald's food evil, even if it's rarely fit for a purpose most First World people have.
-EDIT- For those arguing that they can eat healthy at McDonalds, I really strongly recommend reconsidering your nutrition plan. I didn't want to go there with this comment, I was trying to make the point that a healthy dieter won't opt for McDonalds, but people have seemed to want to argue that they can and apparently do eat healthy at McDonalds. Thats cool with me, but if you have fitness/bodyweight goals to achieve, best to stick with food directly from the farm. In addition, when you get your nutrition right, you feel good, and that feeling is addictive. If you are scrambling to McDonalds and then ordering a 'healthy choice', there is better way.
And thats my two cents.