How can i put on weight?

High calorie diet: Eat foods high in calories: milk shakes with lots of sugar and olive oil. Get supplemental canned milks or drinks with high calories. Find out why you are losing weight ( check thyroid, rule out cancers ).

Eat healthy foods: that are high in calories. Eat 6 meals /day. Work on strength training to build large muscle groups. Work out 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, Avocadoes, granola, trail mix, dried fruits, extra virgin olive oil, canola oil.