Eating more often.Start eating five to six smaller meals a day gradually. To detect while might be hungry, try to become aware of your body's signals. But even if you're not very hungry, you might still need to schedule meal times.eating more often. 

&Sample shakes and smoothies. Steer clear of calorie- and nutrient-dense drinks like diet Coke. But if you're eating on the run, a smoothie or shake made with a combination of high-calorie, nutrient-dense components can be helpful. You might use meal replacement drinks in your weight-gain regimen. 

&Selecting foods high in nutrients. Establish a pattern for eating and drinking foods and beverages that you enjoy and that are high in calories and nutrients. Consult a dietician or your healthcare professional about the recommended daily or meal intake of calories. You can also inquire as to how many servings of each food type you ought to consume.

• But watch what and when you drink. Beverages can make you feel full. If that's the case for you, avoid drinking during a meal or before. But make sure you are drinking enough throughout the day.
• Exercise. Exercise, especially strength training, can help you gain weight by building up your muscles. Exercise also may stimulate your appetite.
• .Finish it off. To increase the caloric content of your meals, including additions like cheese in casseroles or nut butter on whole-grain toast. For an added boost of calories and protein, you can also add liquid or dried milk to your meals. Mashed potatoes and soups are a couple of examples.
• If you experienced an unexpected weight loss, it is best to consult your healthcare professional. You can gain weight in a healthy way with the aid of a nutritionist or your provider. You can work together to develop a plan that meets your needs.If you experienced an unexpected weight loss, it is best to consult your healthcare professional. 

There could be a number of reasons why you aren't at your ideal weight. Two examples include getting well after an illness or aging-related weight loss. Athletes frequently wish to put on muscle rather than just gain weight.

There are two ways to characterize being underweight. It may refer to low weight for height, which is characterized by a body mass index (BMI) below 18.5. It might also be a weight that is 15–20% less than what is normal for that person's age.

Finally if you followed these ways then you can gain weight

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