What is the best way to gain weight for people with stress?

Diet and exercise: The best way is a healthy diet with more calories than you burn and exercise to add muscle which is healthier weight can than just adding fat. Exercise can help with stress too...Win/win.

Eat healthy : High calorie foods. Eat 6 meals/day. Work on strength training to build large muscle groups. Workout w heavier weights w fewer repetitions. Sleep at least 8 to 9 hrs/night. Hydrate well w water. Foods to help w healthy weight gain: almonds, cashews, pecans, sunflower seeds, flax seeds, walnuts, hummus, avocados, granola, trail mix, dried fruits, extra virgin olive oil, canola oil or protein shakes.