Why You're So Bloated After 40: The Complete Guide to Causes and Solutions

Why Bloating Gets Worse After 40

If you feel like you're more bloated now than you were in your 30s, you're not imagining it. Multiple physiological changes that occur after 40 conspire to make bloating more common and more severe. Understanding these changes is the first step toward finding effective relief.

The Hormonal Factor

Estrogen and progesterone both influence gut motility and fluid retention. During perimenopause, fluctuating hormone levels can cause significant changes in bowel habits and bloating patterns. Progesterone has a relaxing effect on smooth muscle throughout the body — including the gut — which can slow transit time and allow gas to accumulate. Many women notice that bloating worsens in the luteal phase of their cycle (the two weeks before menstruation) when progesterone is highest.

Reduced Enzyme Production

Digestive enzyme production naturally declines with age, making it harder to break down certain foods. Lactase (the enzyme that digests lactose in dairy) production often decreases after 40, leading to new-onset lactose intolerance. Amylase and protease production may also decline, impairing the digestion of carbohydrates and proteins respectively. This is why foods that were well-tolerated in your 20s and 30s may now cause significant bloating and gas.

SIBO: The Overlooked Cause

Small intestinal bacterial overgrowth (SIBO) occurs when bacteria that normally reside in the large intestine migrate into the small intestine, where they ferment carbohydrates and produce excess gas. SIBO is more common in women and becomes more prevalent with age. It is characterized by bloating that worsens after eating, particularly after consuming high-fiber or high-carbohydrate foods. Diagnosis requires a breath test, and treatment typically involves antibiotics (rifaximin is most commonly used) followed by dietary modification and probiotic support. Our gut health protocols include post-SIBO recovery supplementation strategies.