For me it was working to eat late in the evening. This way I was actually hungry again in the morning and ate in the end much more

Many of the people struggling to gain weight I have seen to take Apetamin besides shakes and eating.
Link: www.apetaminworks.com

Just type in Apetamin into Youtube and you can find there many videos - testemonies of people taking Apetamin and gaining weight

I wish you good luck!