The short answer
High-heat and open-flame cooking creates two families of chemicals, HCAs and PAHs, that damage DNA in laboratory studies and cause tumors in rodents fed very large doses. Human population studies have not established a definitive link. Small changes to how you grill lower your exposure without giving up the grill.
HCAs form when amino acids, sugars and creatine react at high temperatures, above roughly 300°F. PAHs form when fat and juices drip onto a flame or hot surface and the smoke coats the meat.
In rodents, high doses of HCAs produced tumors of the breast, colon, liver, skin, lung and prostate. The doses used were thousands of times higher than what people eat.
NCI states that population studies have not established a definitive link between HCA and PAH exposure from cooked meats and cancer in humans.
NCI-listed steps that reduce HCAs and PAHs: avoid direct flame, microwave meat beforehand, flip often, remove charred portions, and skip gravy made from drippings.
On this page
Choose how you want to read this
The whole article, with every detail and caution.
This page is for people who grill, pan-fry or barbecue meat and wonder about cancer risk. Cooking meat at high heat forms two families of chemicals, called HCAs and PAHs. The practical steps come first. After that, the page explains what those chemicals are and what the evidence shows.
Changes that lower your exposure
If you want the practical part first, these are the steps NCI lists.
- Avoid direct exposure to an open flame. PAHs form in the smoke when drippings hit the fire.
- Microwave the meat first before high-heat cooking.
- Flip often. Flipping meat frequently reduces HCA formation.
- Remove charred portions before eating.
- Skip gravy made from meat drippings.
None of this requires giving up grilling, and that is deliberate, because the human evidence does not justify that.
What HCAs and PAHs are
Two different families of chemicals form when meat meets high heat.
HCAs, heterocyclic amines, form when amino acids, sugars and creatine or creatinine react at high temperatures. Cooking meat above roughly 300°F, such as grilling or pan-frying, produces more. Well-done preparations have the highest levels.
PAHs, polycyclic aromatic hydrocarbons, form differently. When fat and juices from meat drip onto a flame or hot surface, the resulting smoke rises and deposits PAHs on the food.
What the evidence actually shows
This is where it is worth being careful, because the topic is often written up as if it were settled.
In the laboratory, HCAs and PAHs cause changes in DNA that may increase cancer risk.
In animals, rodents fed high doses of HCAs developed tumors of the breast, colon, liver, skin, lung and prostate. NCI states an important caveat directly. The doses used in these experiments were thousands of times higher than the amounts people get from food.
In people, the picture is unresolved. NCI's position is that population studies have not established a definitive link between HCA and PAH exposure from cooked meats and cancer in humans. Some studies have found associations between high intake of well-done, fried or barbecued meat and colorectal, pancreatic and prostate cancer. Other studies have found no such association.
So the honest summary is: DNA damage in laboratory studies, tumors in rodents at very high doses, and human evidence that has not established a definitive link.
Keeping this in proportion
Because the human evidence is not settled, cooking technique is a reasonable, low-cost adjustment rather than a reason for alarm. Ask your care team about screening and other steps that matter for your own risk.
Sources
Common questions
Do I need to give up barbecue?
No. The human evidence does not support that, and NCI is explicit that population studies have not established a definitive link. What the evidence does support is reducing unnecessary charring, since the chemicals involved damage DNA in laboratory studies. Grilling with a few adjustments is a reasonable middle position between ignoring it and giving it up.
Should I cut off the black bits?
NCI lists removing charred portions among the ways to reduce exposure. It also lists skipping gravy made from meat drippings.
Does this apply to vegetables and plant foods on the grill?
NCI describes HCAs as forming when amino acids, sugars and creatine or creatinine react at high heat, and its guidance is about cooked meat. This page does not cover vegetables.
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Written by: Cancer ExplainedSources last checked: 2026-07-30 what this meansLast updated: 2026-10-16Next planned review: 2027-07-30
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Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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