A reasonable and healthy step you can take to reduce your risk of obesity is to include physical activity each day for an hour.
Consuming more processed foods is definitely not healthy, considering just in general, processed foods are unhealthy. Engaging in a walk around the block monthly for an hour isn't really going to do anything since it is monthly. Eliminating the use of electronic devices isn't going to help either, as it has nothing to do with health and/or obesity. You should include physical activity each day for an hour (30 minutes is suggested).