I just started on latuda, also. In addition I had oral surgery and have to eat a liquid or very soft diet. I found that a smoothie made with maple syrup as sweetener got me a decent number of calories. My doctor said I could even just take the real maple sugar straight.

It doesn't have to be a traditional meal. (24 oz of green smoothie made with sugar from tropical smoothie was about 477 calories). Hope that helps.