I agree with JAM, you must keep track of the daily calorie intake. My nutritionist said I needed 2,700 calories a day minimum. Just as I was finishing up my second round of chemo I couldn't eat by mouth anymore, and so I was pouring 2 cans of Carnation VHC (560 calories per can) down my peg tube 3 times a day. Believe me, the nutrition and calories help in the recovery from radiation and chemo - like a medicine.
You can purchase Carnation VHC 560 calorie drink on Amazon.com. Make sure to go through the link on the main forum page of this site.
Also, along with the Benefiber I was taking daily, I was also taking stool softner, 2 pills twice a day, which was the Walmart brand. After a couple bouts of constipation, I swore I would never go through that again.
Tom