Skipping breakfast isn't unceasingly the healthiest habit, and it has been related to weight gain, according to a research in the American Journal of Epidemiology in 2003. The study authors looked at the dietary patterns of around 500 subjects over the course of a year, that pick the diet trends linked to weight gain. They found that people who regularly skip breakfast had a higher risk of obesity. A second study, that was explained in the Journal of Rural Medicine in 2014, found similar results and even noted that skipping breakfast was more fully linked to weight gain than eating before bed.
People who skip breakfast had a higher risk of obesity, that doesn't necessarily mean skipping breakfast is the reason they gained weight. It could be that people who skip breakfast tend to have other lifestyle habits that cause obesity -- for example, hitting the drive-through or eating packaged convenience foods.