Unhealthy diet can be the overconsumption of food, and the severe imbalance in nutrients. Usually, it is recommended to take in calories based on one's lifestyle. If someone is active, they should consume more food so that they would have more energy. Likewise, if someone is less active, they should eat lesser food to avoid overconsumption. When there is an excess in calories, that is not being used up, this can lead to weight gain. Weight gain can be severe when that person's (BMI) Body Mass Index exceeds the acceptable BMI — i.e. they are deem overweight or severely overweight. This is because obesity can lead to diabetes. The amount of health risks from an unhealthy diet increase when you consider the impacts of having too much or too little of one nutriet.