Putting weight on is a term that refers to gaining weight which can happen due to a variety of reasons such as a sedentary lifestyle, poor diet, or an underlying health condition. Some synonyms for putting weight on include gaining pounds, getting heavier, increasing in size, bulking up, putting on mass, growing in weight, and becoming overweight. Though weight gain can happen to anyone, it is important to be mindful of a healthy weight and to take necessary measures to avoid becoming obese or developing chronic diseases such as diabetes, heart disease, or high blood pressure. Making healthy lifestyle choices such as regular exercise and a well-balanced diet can help in maintaining a healthy weight.