Interesting, my afib isn't that bad. But, when I excel my exercise which is lap swimming, the next day I am retaining more water which indicates the heart isn't working as well. It's a delicate dance. Food is important. Today made salt free bean soup with sauteed onion (avocado oil) and celery. Red pepper, turmeric, and a salt sub. Very good. Also home made bread without salt. My husband comes home with a beef dinner with the usual generous supply of salt and sugar. I love that food but keep it to a minimum. I eat a little bit, a few bites, but mostly eat the food I prepare. He's tired of my food but we manage. My point is you have to be on the correct eating 98% of the time. If you start to get lazy and lax, like I do because I'm feeling good, it only takes a couple of days and I'm carrying a few pounds of water, fatigued etc. Anyway, you can improve. It's a bunch of experiments and carefully observing what works and what doesn't.