Garlic

What it is

Garlic (Allium sativum) is a bulbous plant in the onion family, cultivated for over 5,000 years. Each bulb contains 10-20 individual cloves. It is available fresh, dried, powdered, as garlic oil, and as aged garlic extract. China produces about 75% of the world's garlic.

Garlic is arguably the most universal savory flavoring in world cuisine, appearing in virtually every culinary tradition from Mediterranean to Asian to Latin American cooking. It is used raw (in dressings and salsas), sautéed, roasted, fermented (black garlic), and pickled.

Why garlic may support an anti-inflammatory diet

When garlic cloves are crushed or chopped, the enzyme alliinase converts alliin into allicin, a reactive sulfur compound responsible for garlic's pungent smell. Allicin has demonstrated anti-inflammatory effects in cell studies by inhibiting NF-kB activation and reducing the production of pro-inflammatory cytokines.

Diallyl disulfide (DADS) and S-allyl cysteine (SAC), found in cooked garlic and aged garlic extract respectively, have been studied for their effects on inflammatory pathways and oxidative stress. SAC is more stable than allicin and is the primary active compound in aged garlic extract supplements.

Garlic's cardiovascular effects — modest reductions in blood pressure and improvements in lipid profiles — have been reviewed in multiple meta-analyses. Since cardiovascular disease involves chronic inflammation, these effects are relevant to the broader anti-inflammatory picture.

Key nutrients and compounds

A 3g clove of raw garlic provides approximately 0.6mg manganese (5% DV), 0.9mg vitamin C (1% DV), 0.05mg vitamin B6 (3% DV), and 5.4mg selenium (1% DV). While individual cloves are small, garlic's value lies in its organosulfur compound density rather than macronutrient content. Allicin yield is approximately 2.5-4.5mg per fresh clove when properly crushed.

Potential health benefits

• Contains allicin and other organosulfur compounds with studied anti-inflammatory properties
• May support modest blood pressure reduction based on meta-analysis evidence
• Provides antimicrobial compounds that have been used traditionally for immune support
• Enhances the flavor of whole-food cooking, supporting dietary adherence
• Available in multiple forms (fresh, aged, black) with different compound profiles

How to eat garlic

• Crush or chop garlic and let it sit for 10 minutes before cooking to maximize allicin formation
• Add minced garlic to sautéed vegetables, soups, and grain dishes
• Roast whole garlic heads at 200°C for 40 minutes for a sweet, mellow spread
• Use raw garlic in salad dressings, hummus, and chimichurri sauce
• Try black garlic (fermented) for a sweet, umami flavor without the pungency
• Add garlic to olive oil-based sauces and marinades for Mediterranean-style meals

Shopping and storage

Choose firm, plump garlic bulbs with tight, unbroken skin. Store whole bulbs in a cool, dry, ventilated place (not the refrigerator) for up to 2 months. Once broken, use individual cloves within 10 days. Pre-peeled garlic is convenient but may have reduced allicin potential.

FAQ

Evidence note

Garlic has been studied in numerous clinical trials and meta-analyses, primarily for cardiovascular outcomes. A 2020 Cochrane review found modest blood pressure-lowering effects. Anti-inflammatory research is mostly preclinical, though the cardiovascular benefits suggest indirect anti-inflammatory relevance.

This page describes garlic as a supportive food within a broader anti-inflammatory eating pattern, not as a standalone medical treatment.

References for further reading

• USDA FoodData Central
• Harvard T.H. Chan School of Public Health
• Dietary Guidelines for Americans