Why are there different diet plans?

I would like to know why are some diet plans different than others. I've surfed the website and I read some of the answers about diet plans and some patients are not even 1 year post-op and they are eating steak, pasta, doritos, candy bars, etc....Why is that? After my surgery the Diet clinic put me on a strict diet for the first 6 weeks then after that I still have to be on a strict diet for a year. I don't have a problem following the diet plan but the food is so boring that I don't want to eat. What's up with that? Please help, I am very confused.

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