Here are some healthy ways to gain weight when you're underweight:

  1. Eat more frequently. When you're underweight, you may feel full faster. ...
  2. Choose nutrient-rich foods. ...
  3. Try smoothies and shakes. ...
  4. Watch when you drink. ...
  5. Make every bite count. ...
  6. Top it off. ...
  7. Have an occasional treat. ...
  8. Exercise.

Product Help in gaining weight

1. Endura Mass Weight Gainer Kesar Pista 

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Gain your Weight Healthily with Endura Mass Gainer with support of Mettle Peanut Butter. Increase your calorie intake and see yourself gaining healthy weight. With weight gain also maintain your protein intake with Mettle Peanut Butter.

2. Strava Nutrition Weight Gainer

✅Premium protein source : Whey protein imported from USA is the only protein source ✅Optimum blend : Protein to Carb ratio is 1:5 is the best required to gain healthy weight. ✅Healthy : Weight Gainer also contains added Vitamins and Minerals for healthy weight gain and Good personality.

3. Rathira Ayurveda Products (Weight Gainer) 

Stimulates appetite and makes user to consume more food and calories that will help to increase weight add new muscle. Allergen information: allergen_free. Container type: Bottle

4. Nutrela Weight Gainer

HIGH CALORIES – While other mass gainers provides 3480 calories, Patanjali Nutrela Weight Gain is formulated to deliver highest calorie 3834 kcal per serving for optimum weight gain. SCIENTIFIC FORMULATION : A unique balanced formulation of easy to absorb proteins- 20g, complex carbohydrates – 66.6g, Fats – 8g and 52 essential nutrients – 11 Natural herbs, 12 Minerals, 11 Bio Fermented Vitamins and added Glutamine VEG & SAFE TO USE – Patanjali Nutrela Weight gain has no side effects and is 100% vegetarian wight gainer. Comes with LAB REPORT from NABL Govt. Accredited lab which can be downloaded post purchase .

5. GNC Pro Performance

GNC Pro Performance Weight Gainer 2200 Gold supplies that extra calories you need to put on the added kilograms you want When mixed with double toned milk, 3 heaped scoops provides 2200 calories, 73 grams of protein from an exclusive blend and 440 grams of carbohydrates It also supplies important ingredients like BCAA that every athletes want.

6. MuscleBlaze Weight Gainer

474 CALORIES: MuscleBlaze Weight Gainer is a simple and effective healthy weight gain supplement in India for any adult looking to gain weight. It is crafted to fuel your muscles with 474 calories per serving with milk to promote faster muscle synthesis and prevent post-workout muscle loss HIGH PROTEIN: MB Weight Gainer provides 19.5 g of protein in every 100 grams serving with milk to help build lean muscle mass. This special formula enables your body to gain and maintain a healthy weight 27 VITAMINS & MINERALS BLEND & DIGESTIVE ENZYMES BLEND: This weight gainer protein supplement is fortified with 27 vitamins & minerals to help bridge the nutrient gaps, boost immunity and performance. It also supports the synthesis of new muscle build-up. The blend of digestive enzymes helps in improving digestion and absorption of healthy nutrients