What to do if i continue losing weight. how to gain it back?

Consider working w a: nutritionist. If reason for weight loss is not known - have your doctor evaluate. at healthy high calorie foods. Eat 6 meals/day. Work on strength training to build your 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 or walnuts.