Hi, I have had a heart block in the past, hence a pacemaker. I have been told by a cardiologist that because I have always kept myself fit, it has resulted in me having a low heart rate at rest, hence blood pressure can go low. The potential exists to blackout. The pacemaker does cater for this, I.e. extra beats or too low. I have an underlying autoimmune disorder. I like the idea of HUEL, as I can keep myself in line with nutrition. I have started using it, only for a day at the moment. With that in mind is there anything that might cause a problem as a consequence of taking HUEL. My exercise levels have caused me a problem - work that one out. Maybe the word is MODERATION in everything _ lol.