Q: What is better ? beef or chicken.I have heard u mustnt eat many beef cause this way u have more chances for having cancer later.

A: Both are fine. With both you need to make sure to select leanest meat possible. For chicken that usually means skinless chicken breast (which is almost entirely pure protein) and for meat it's 90% or higher leanness (which is about half protein/half fat by calories, at 90% lean). If you're concerned about red meat, then you can skip entirely and go with only chicken or fish or other sources of protein.

All the studies I have seen that found a supposed link between red meat and cancer did not make any attempt to differentiate about the rest of the person's diet. A typical red meat-eater has an extremely unhealthy diet that's full of fatty meat, white bread, sodas, and other junk while nearly devoid of vegetables, fruits, or whole grains. I've never seen a study done where they examine red meat-eaters who eat only lean meats and a ton of green veggies along with fruits and whole grains (which is the kind of diet I recommend, whether you're trying to lose fat or build muscle). Such a study comparing health-conscious red meat-eaters and, say, vegetarians would be a lot more telling about the true dangers or lack thereof in red meat.

But as I said, if you have concerns about it, just substitute red meats with other protein sources.