There are two things to consider when putting together a nutrition plan, reality and your goals. Consider what your actual needs are, this is looking at reality. Once you know your reality, then you can set goals and plan steps to get there.
A diet is something you do for a set period of time, like a month or a season. Immediately after that time period people go back to the habits that got them in trouble in the first place and the weight pours back on. That cycle leads to several problems.