Very low-carb diets have not been well-studied specifically in those with AFib. However, restricting carbs to under 50 grams per day may lead to ketosis, dehydration, and electrolyte imbalances that could potentially impact heart rhythm. Moderately low-carb Mediterranean-style and DASH diets are likely safer options, according to most Atrial Fibrillation Specialists. Key Takeaways...