Be careful to increase your weight with lean body mass and not fat, so don't eat junk. You should consider eating three nutritious meals per day (plenty of 'good' colourful food, meat, chicken, vegetables, etc.) and also three high quality protein smooothies or shakes. This will provide you with the increase in calories, but safeguard you against the trap of eating too much or eating junk food. Whatever you do, ignore the advice to consume lots of fattening food like McDonalds! To be healthy and have control over your weight, focus on increasing healthy weight (muscle) and not fat. I would also recommend speaking to a Herbalife Wellness Coach. Hope this helps.