You can lose weight and stay fit by changing your habits. There are a few steps with the help of which you can stay fit like chewing your food properly and doing exercise in the morning and evening.
People follow a concise diet although it is good it is not the only method.
And staying fit means not a slim and muscular body but it’s mean we can do everything which a human can do. Don’t compare yourself with others it is not the right way to approach it, you should focus on feeling, mental health, activities, muscle strength.
It is not that easy process but first clears your mind with that why you want to lose weight and stay fit.
Then your diet plays an important role in your life and tries to eat homemade and green food as much as possible.
Exercise and yoga are important parts of life.
Basically, everybody knows about it and very few people care about it.
Fitness is not what we see around us, in spite of that it is to feel healthy and fit from inside along with body shape. Body shape is the secondary concept but insider fitness is the primary concept.
I have free advice for you do not take advice for health from another person but it is of understanding of ourselves. Everybody has a different body and requirements so the advice of others does not work but the understanding definitely will.

Related: Healthy and good nutrition