How to Gain Weight Fast: 7 Secrets for Skinny Guys Whether you are underweight or just tired of being the skinny guy at the gym, the top nutrition strategies to gain healthy weight remain the same - eat enough food and the right types of food to gain weight. Even though putting on weight can feel challenging for some, the process does not need to be complicated. Ignore the bro science and simplify your health goals by focusing your energy on habits that are going to move the needle. Here’s your no-nonsense, go-to guide for how to gain weight as fast as possible. Are You Underweight? How to Tell. Being skinny is one thing, being underweight is another. The easiest way to tell if you are under a normal body weight for your height and age is by checking your body mass index (BMI). A BMI below the normal range could mean you are underweight, but ultimately you’ll want to check in with your doctor or a registered dietitian for more guidance. Get your BMI in less than a minute using this free BMI calculator. So you’re strength training, eating massive amounts of protein and not seeing progress, what gives? The bottom line is: you’re not eating enough food. At the most basic level, weight gain and weight loss are a calories game. If you aren’t eating enough calories to gain weight, it does not matter what you eat or how many times you hit the weights, it’s just not going to happen for you. Outside of basic physics, individual health factors can also play a role. Certain medications, health conditions, or your genetic predisposition can make gaining weight an uphill battle for some, requiring a bit of dedication in the process. Mainly learning to eat even when you’re not hungry, and to the point of being uncomfortably full. Regardless, step one always remains the same - eat more food. How Many Calories Do You Need to Gain Weight?