Excessive farting is caused mainly by the accumulation of gas in the digestive system. This can happen for several reasons including:

• Eating foods that are difficult to digest, particularly those high in fiber or certain sugars called FODMAPs (found in fruits like apples and pears, vegetables like onion and garlic, beans, and some grains).
• Swallowing excess air due to eating quickly, chewing gum, smoking, or anxiety.
• The action of bacteria in the gut fermenting undigested food, which produces gas as a byproduct.
• Medical conditions such as irritable bowel syndrome (IBS), lactose intolerance, gluten intolerance, constipation, or other digestive disorders.
• Intake of carbonated drinks, artificial sweeteners, and some medications or additives that affect digestion.

In short, farting a lot is often linked to diet, digestion, and sometimes underlying health issues that affect how food is processed in the gut. Managing diet and behaviors like eating pace can reduce excessive flatulence.