Being hungry and annoyed is a very common occurrence. Hunger can sometimes trigger many different emotions, make things seem much more difficult than they are and generally be difficult to deal with. However, hunger and mood swings are much more serious than you might think.A new study suggests that counting calories might not just be unpleasant; it could actually increase your risk of depression. The research, published on June 3 in BMJ Nutrition Prevention & Health, found that people on low-calorie diets showed more signs of depression compared to those not dieting.Who's Most Affected?The study's results showed that overweight people and men seemed to be especially vulnerable to these mood changes when they were on a low-calorie diet. Experts noted that diets restricting calories were linked to higher depression scores, which goes against what some earlier studies found. They also added that men and overweight individuals appear to be more sensitive to the negative effects of limiting what they eat. Researchers believe that cutting calories might also deprive the brain of important nutrients it needs to keep your mood steady.How the Study Was DoneFor this research, scientists looked at health information from over 28,500 people who participated in the U.S. National Health and Nutrition Examination Survey between 2007 and 2018. Everyone in the study answered questions about depression symptoms and whether they were following any specific diet.In total, a little less than 8% of the people in the study reported having symptoms of depression. The researchers then sorted everyone based on their eating patterns. This included diets that limited calories, diets that cut out specific nutrients like carbs or fat, or diets designed to help manage health problems like diabetes or heart disease. About 87% of the people weren't on any special diet, while 8% followed a low-calorie diet, 3% limited certain nutrients, and 2% followed a diet for health reasons.Surprising ResultsThe study's findings indicated that those on diets that restricted calories had higher depression scores than those who weren't dieting. Even more, overweight people who were either eating fewer calories or limiting certain nutrients had even higher scores. The study also found that any kind of diet at all seemed to affect men's moods.These results directly go against what some earlier studies had found, which suggested that low-calorie diets might actually help with depression. The researchers explained that this difference might be because previous studies were often carefully controlled experiments where people followed specific diets designed to ensure they got all the necessary nutrients. In everyday life, cutting calories can often lead to not getting enough important nutrients and can cause stress, which might make depression symptoms worse. For example, the brain needs things like glucose (from carbohydrates) and fatty acids (like omega-3s) to work well. The research team wrote that diets low in these can, in theory, make brain function worse and increase emotional symptoms, especially in men who might need more nutrients. People on such diets might also become depressed if they don't lose weight or if their weight goes up and down.