Some words about my hobby

I'd like to write about my hobby. This is not just a hobby, I can call it "my way of life".
A couple of years ago I was interested in healthy food and healthy living. I read numbers of books and articles about dietology, organic foods, sport and activity. It was my passion. I refused to eat fast-food, fatty meat, wheaten flour and semi-finished products. Later I started to eat non-gluten foods. ( non-gluten makes sense, but  usually we say "gluten-free" foods)
My family followed me. My husband made up his mind to lose weight and asked me to help him. I made a meal plan for him and he lost about 12 kilos during 4 months. I'm very proud of him!
Now I'd like to help people to become more healthy. If my friends ask me about their nutrition I really enjoy to be useful being useful / making myself useful. I try to explain the basic principles of a healthy life and made make a meal plan if they would like one /me to do that.

Good work Yekaterina, I've put the corrections in blue and underlined them, with some extra suggestions of what you could say. 

Some words about my hobby

I'd like to write about my hobby. This is not just hobby, I can call it "my way of life".
A couple of years ago I was interested in healthy food and healthy living. I read numbers of books and articles about dietology, organic foods, sport and activity. It was my passion. I refused fast-food, fat meat, wheaten flour and semi-finished products. Later I started to eat non-gluten foods.
My family followed me. My husband made up his mind to lose weight and ask me to help him. I made the meal plan for him and he lost about 12 kilos during 4 months. I'm very proud of him!
Now I'd like to help people to become more healthy. If my friends ask me about their nutrition I really enjoy to be useful. I try to explain the basic principles of healthy life and made a meal plan if they would like.

My hobby,

I'd like to write about my hobby. This is not just hobby, I can call it "my way of life".
A couple of years ago I was interested in healthy food and healthy living. I read numbers of books and articles about dietology, organic foods, sport and activity. It was my passion. I refused ( to eat) fast-food, fat (fatty) meat, wheaten flour and semi-finished products. Later I started to eat non-gluten ( gluten free) foods.
My family followed me. My husband made up his mind to lose weight and (asked) me to help him. I made (a) meal plan for him and he lost about 12 kilos during 4 months. I'm very proud of him!
Now I'd like to help people to become more healthy. If my friends ask me about their nutrition I really enjoy to be useful  ( am very happy to help them).  I try to explain the basic principles of healthy life  ( living)    and made a meal plan if they would like.     (make a meal plan if they require one.)