How cooking over wood fire vs. gas affects the gut health of what you eat

Cooking over an open wood or charcoal fire, still common in provincial kitchens and for dishes like inasal or grilled specialties, produces food with a different chemical profile than the same dish cooked on a gas stove, separate from the smoky flavor everyone notices first. The fuel source is one piece of the larger question of how cooking method affects your gut beyond just the ingredients themselves.

Where the two methods diverge

The compound that matters most: PAHs and HCAs

Both compound groups have been studied for links to increased cancer risk with frequent, heavy exposure, and both form more readily with open-flame, smoky cooking than with gas stove cooking.^[1]

Why occasional grilled food isn't the same concern as frequent exposure

The research linking PAHs and HCAs to health risks is based primarily on frequent, heavy consumption of well-charred grilled and smoked meat over years, not occasional inasal or barbecue.^[1] A household cooking primarily over wood fire regularly, rather than occasionally grilling for a special meal, is the pattern where this becomes more relevant to consider, similar to how occasional fried street food differs from daily fried food as a dietary pattern.

What reduces compound formation regardless of fuel source

• Trim visible fat before grilling to reduce flare-ups that create more smoke and char.
• Marinate meat before cooking. Some research has shown this reduces HCA formation, possibly due to antioxidant compounds in marinades interfering with the chemical reactions involved, the same principle behind vinegar-based marinades like sukang tuba and sinamak used in Filipino vinegar cooking and dishes such as adobo.^[2]
• Remove any heavily charred or blackened portions before eating, rather than eating them, to reduce exposure to the compounds concentrated there specifically.