1. Don't drink water before meals. This can fill your stomach and make it harder to get in enough calories. 2. Eat more often. Squeeze in an additional meal or snack whenever you can, such as before bed
. 3. Drink milk. Drinking whole milk to quench thirst is a simple way to get in more high-quality protein and calories. 4. Try weight gainer shakes. If you are really struggling then you can try weight gainer shakes. These are very high in protein, carbs and calories. 5. Use bigger plates. Definitely use large plates if you are trying to get in more calories, as smaller plates cause people to automatically eat less. 6. Add cream to your coffee. This is a simple way to add in more calories. 7. Take creatine. The muscle building supplement creatine monohydrate can help you gain a few pounds in muscle weight. 8. Get quality sleep. Sleeping properly is very important for muscle growth. 9. Eat your protein first and vegetables last. If you have a mix of foods on your plate, eat the calorie-dense and protein-rich foods first. Eat the vegetables last. 10. Don't smoke. Smokers tend to weigh less than non-smokers, and quitting smoking often leads to weight gain.