Walking is great for you! It helps you heart. It reduces stress. It is good for your joints and bones. It lowers your risk of lower back pain. It will help you live a longer healthier life.
Walking it is only so good at weight loss. An average person walking an hour burns less than 200 calories... this is the amount of calories in a candy bar. Of course, walking faster or for more time will burn more calories. But unless you are running up hills, it only does so much.
As the saying goes, you lose weight in the kitchen, not in the gym.
If your goal is weight loss, reducing the number of calories you eat is far more effective than exercise
. Of course, you should do both... and given the numerous other advantages to exercise to give you a longer, healthier life, you should certainly keep exercising.