Stuck in a rut

So at the moment I'm stuck in such a rut :(

In the past 12 months I've gained 35lbs. I know it may not seem much to some but for me its the most I've ever gained.

I do eat quite well. I try and have 5 lots of fruit and vegetables a day and drink 2 litres of water. I have very little sugar in my diet.
My downfall is exercise. As much as I'd love to go to the gym, I can't and haven't been able to for a while.

I've had a broken and dislocated kneecap for the last year or so and I'm awaiting surgery which is due to take place in the summer. After that I'll be in a wheelchair for the first 6 weeks then on crutches for the following 8-10 weeks. The thought of gaining more weight in this time due to being quite inactive scares me.

Question is, can you truly lose weight just from a healthy diet? :(

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