Eat relatively healthily, avoiding saturated fat and salt? Basing meals on starchy carbohydrates, with moderate amounts of lean protein and low-fat dairy.
Then consider that a meta-analysis of 72 studies found no link between saturated fat and heart disease.
Many starches are turned to glucose in the body faster than table sugar.
Fructose glycosylates haemoglobin seven times more than glucose.
Lean protein is the fastest way to deplete your liver of vitamin A.
So if you have AF from impaired electrical/nerve stimulation/conductivity/insulation, try redressing the balance of your diet.