Kimchi & sauerkraut

Why it matters

Kimchi (Korean fermented cabbage and vegetables) and sauerkraut (fermented cabbage) earn their place not through a single nutrient but through what they do for the gut. Fermentation fills them with live lactic-acid bacteria, and a growing body of research points to the gut microbiome as a behind-the-scenes regulator of hormones — most intriguingly estrogen. A specific community of gut microbes, nicknamed the "estrobolome," helps determine how much estrogen is reabsorbed versus excreted, which means gut health and estrogen balance are more connected than anyone assumed a decade ago.

What's inside

The active ingredient is live probiotic bacteria (mainly Lactobacillus), which support digestion, immunity and the microbial balance that influences hormone metabolism. Both foods are very low in calories and high in fibre, which feeds beneficial gut bacteria, and they retain vitamin C and vitamin K from the raw vegetables. Kimchi adds garlic, ginger and chilli, layering in their own compounds. The main thing they're not low in is sodium — fermentation relies on salt.

For men

For men, the gut connection is just as relevant: a healthier microbiome supports lower systemic inflammation and better nutrient absorption, both of which create a friendlier environment for hormone production. There's no direct "kimchi raises testosterone" claim to make — and we won't pretend otherwise — but the foundational gut benefits, plus the appetite for spicy, flavourful food it satisfies, make it a smart everyday addition.

For women

The estrobolome link makes fermented vegetables genuinely interesting for women. A balanced gut microbiome helps the body process and clear estrogen appropriately, which matters across the cycle, in conditions of estrogen excess, and through menopause. The science is still developing rather than settled, so the honest framing is "promising support for the system that handles your hormones" rather than a guaranteed fix — but it's low-risk, low-cost and easy to adopt.

How to eat it

Buy it raw and refrigerated (look for "unpasteurised" or "live"), because the shelf-stable, pasteurised jars have had their probiotics cooked out. Eat it cold as a side, piled onto eggs, grain bowls, sandwiches and salads, or alongside rice and protein — heating it kills the cultures, so add it after cooking. A couple of forkfuls daily is plenty; start small if you're new to fermented foods, as the gut takes time to adjust.

Worth knowing

Salt is the main caveat — these are high-sodium foods, so moderate portions matter if you're watching blood pressure. Introduce them gradually to avoid temporary bloating while your microbiome adapts, and choose live, unpasteurised versions or the probiotic benefit is lost. For most people they're a cheap, delicious, low-calorie way to support the gut that, in turn, helps regulate hormones.

Bottom line

Kimchi and sauerkraut won't spike any hormone directly, but by feeding a healthy gut — and the "estrobolome" that helps manage estrogen — they support the system that keeps your hormones in balance, one forkful at a time.