I think that is sorta natural except maybe too frequently.
When we eat breakfast, that food ingested stimulates the digestive system, and we normally would defecate a short time later. Same if we have a hot beverage with breakfast.
When a person eats a lot of junk food, that can easily cause problems.
You can help yourself by making a sensible eating plan. Three balanced meals a day and an apple or fruit for a snack, not junk food.
