One should strive for a healthy balance between eating solely for nutrition and eating solely for pleasure. We are genetically wired to enjoy food, it's what helped our ancestors survive. Food stimulates pleasure centers in the brain. Deriving pleasure from food is healthy and natural.
The "food is only about nutrition, not pleasure" can be a harmful trap to fall into. I know because I've been there. One time, I had a really bad school teacher that told the whole class, "School is not a place to have fun. It is a place to learn." Never mind the kids that had fun learning, like me. The message we got was that learning was supposed to be bland, boring and painful. It became a self fulfilling prophecy, the class was indeed boring.
A lot of people who enter into a diet/eating routine thinking that it's not about enjoying the food can end up miserable. It is completely possible to eat healthfully and pleasurably at the same time and there's nothing wrong or unhealthy about enjoying your food.
I know if I stopped eating for pleasure, I would lose a ton of weight(not what I'm shooting for though). I absolutely love going out for sushi. It's probably the most pleasurable food out there. Now, I could sit at home and eat bland, boiled rice, unseasoned, poached fish and sliced veggies. It's basically the same thing nutritionally, but aesthetically, it doesn't even begin to compare. I also believe that the pleasure gained is actually good for us. It's good to feel good, and it's bad to feel like we have to eat something solely for its nutritional value.
To the OP: if you're a person that just naturally doesn't enjoy any food then putting on weight will be more difficult. Is it that you don't enjoy any food at all or do you only enjoy foods that you deem "unhealthy"?