When patients are on dialysis they should not eat. Choking is a big concern. Doing the Heimlich on a patient strapped to a dialysis chair while watching the needles is not a good idea. Secondly, during dialysis your blood pressure drops naturally due to fluid removal and lower volume in the body. If you eat, digestion will cause the blood pressure to dip down further. Turning the UF (fluid removal) off when the blood pressure crashes is counterproductive to treatment.