List five tips for gaining weight.

1. Eat at regularly scheduled times.
2. Eat more frequently, spend more time eating, eat high-calorie foods first if you fill up fast, and always start with the main course.
3. Take time to shop, to cook, and to eat slowly.
4. Put extra spreads (e.g., peanut butter, cream cheese, or cheese) on your foods. Take seconds whenever possible and eat high-calorie, nutrient-dense snacks (e.g., nuts and cheese) during the day.
5. Supplement your diet. Add high-calorie drinks that have a healthy balance of nutrients (e.g., whole milk).
6. Try to eat with people you are comfortable with. Avoid people who you feel are analyzing what you eat or make you feel as if you should eat less.
7. If you are sedentary, be aware that moderate exercise can increase your appetite. If you are exercising, moderate your activities until you've gained some weight.
8. Avoid diuretics, laxatives, and other medications that cause you to lose body fluids and nutrients.
9. Relax. Many people who are underweight operate in high gear most of the time. Slow down, get more rest, and take steps to control stress and anxiety.

Just checked your answer with a friend, thanks for the valuable input.