9 Answers

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Drink Ensure.

I find it ironic that your other question has to do with the brand of alcohol.  You need to watch what you put inside your body, pal.

Exercise, muscle mass is an excellent way to add weight. Eat the proper fuel for maintenance....

Eat at McDonald's! :D

Follow me for a day, just kidding!  I actually have lost a few, anticipating the winter gain. 

Load your pockets with change….or….Blend two raw eggs with peanut butter, chocolate, milk and 2 tablespoons of soy protein powder  to taste. Crushed ice with that helps or heat it to custard. Eat that and/or variations twice daily along with meals. Play with your food for flavors and textures that you like. I have noticed folk who crave potatoes in all their forms gain weight quickly. Controlling weight should be your goal….what is right for you...get a doctors opinion.

Eat loads of junk.

carry rocks in your pockets

To gain weight, you need to eat more calories every day compared to you burn with exercise. You can also gain weight by increasing size of your muscles. Start with a caloric calculator to determine the number of energy you you'll need to consume every single day to gain weight. You'll probably have to increase your calorie intake, and you can do this by eating a larger volume of meals or by choosing foods which are energy-dense (high in calories).