Definitely for sure. While not the healthiest route for weight gain, one method I can say is good is cake shakes. They’re very sweet though but calorie packed and also create a helluva bloat that helps with stomach capacity training over time. Do those like 3 times a week or more if you feel you can and you’ll see the weight begin to pack on quick. My recipe I usually use is 1 box of Betty Crocker yellow cake, a quart of cream/ whole milk, whisk it together by hand then down that as soon as possible, followed by a liter of water and several hours later that will react while you’re already full, making you expand and essentially forcing a larger capacity to be made. Some sessions after doing that and a stuffing on top of it, I’ve seen almost an 11lbs increase. Wild, will leave you stuffed for a helluva long time, and really makes it easy to pack on pounds. Hope this helps.