Key Takeaways
  • High-temperature cooking methods like frying and grilling tend to generate substances such as acrylamide, heterocyclic amines (HCAs), polycyclic aromatic hydrocarbons (PAHs), formaldehyde, and cholesterol oxidation products (COPs).
  • Acrylamide formation is promoted at temperatures above 120°C, while HCAs and COPs are generated at even higher temperatures (refer to reports from the International Agency for Research on Cancer and the Ministry of Agriculture, Forestry and Fisheries).
  • You can reduce risks by adjusting cooking methods (steaming, boiling, simmering, marinating, shortening cooking times, and being mindful of oil usage).
  • Choose cooking oils with high heat stability and avoid reusing oil. It's also important to consume plenty of vegetables and antioxidants.

Introduction: "Good Ingredients = Good Food" Is Not Always True

Even if we usually pay attention to "good ingredients," cooking methods alone can increase health risks. High-temperature cooking, such as deep-frying or grilling over high heat, while creating savory flavors, is known to produce harmful substances like acrylamide, heterocyclic amines, and cholesterol oxidation products. Based on insights from the International Agency for Research on Cancer (IARC), Japan's Ministry of Agriculture, Forestry and Fisheries, and the Food Safety Commission, we've compiled practical measures you can take in your daily cooking. We've tried some of these ourselves and found that it's easier to implement changes than we thought.

Main Harmful Substances Generated by High-Temperature Cooking and Their Characteristics

Acrylamide: Carbohydrates + Asparagine Reacts at 120°C or Higher

It is easily generated when heating bread, potatoes, and cookies, and the Ministry of Agriculture, Forestry and Fisheries also explains its formation mechanism. The International Agency for Research on Cancer classifies it as "probably carcinogenic to humans," and neurotoxicity has also been pointed out. For potatoes, you can reduce it by soaking them in water after cutting to reduce starch and sugar, and by making the browned surface lighter.

Heterocyclic Amines (HCAs) and PAHs: Beware of Charred Meat and Fish

When meat and fish are grilled or seared at high temperatures, amino acids and creatine change to form HCAs, while smoke and direct flames generate PAHs. Charred parts and smoked foods tend to contain high amounts of these, so removing charred bits and avoiding prolonged direct flame cooking are effective measures.

Cholesterol Oxidation Products (COPs) and Oil Oxidation Products

When animal fats are heated or oils containing unsaturated fatty acids are used at high temperatures, cholesterol and fats oxidize, forming COPs and aldehydes. These have been reported to be associated with cytotoxicity and arteriosclerosis risk. Managing the type of oil and heating temperature is crucial.

Which Ingredients and Oils Require Special Attention? Conditions and Examples of Easy Formation

The basic principle is that the longer and hotter the cooking, the more these substances are generated. Specifically: - Stir-frying, deep-frying, grilling, and charcoal grilling: Temperatures often exceed 160-200°C, increasing the likelihood of HCA, PAH, and COP formation. - Roasted foods (e.g., instant coffee, hojicha): Acrylamide and other substances can be generated during high-temperature roasting. - Cooking oils: Oils rich in polyunsaturated fatty acids (e.g., common egg oil, unrefined vegetable oils) are prone to oxidation, and excessive heating increases harmful substances. Choosing high-oleic acid oils or refined oils with high smoke points (e.g., refined sesame oil, rice bran oil, high-oleic sunflower oil, avocado oil) provides relatively more stability. When we tried it at home, simply boiling potatoes once to wash away excess sugar before deep-frying them resulted in a lighter fried color, and the taste was still delicious.

Practical Cooking Tips: How to Achieve Satisfaction Even with Low-Temperature Cooking

Here are some easy-to-incorporate daily measures: - Revisiting cooking methods: Utilizing steaming, boiling, simmering, low-temperature oven cooking, slow cookers, and sous vide can suppress harmful substances. - Avoid charring: Do not grill over direct flame for long periods. Sear the surface quickly over high heat, then reduce the heat, and turn frequently to avoid localized overheating. - Utilize marinades: Research suggests that marinating with antioxidant-rich ingredients like lemon, vinegar, green tea, garlic, ginger, and rosemary can suppress HCA formation. The lemon + garlic marinade we tried had good flavor and also reduced charring. - Oil handling: Choose oils with high heat stability and do not reuse them. If the oil starts smoking, the temperature is too high, so lower it or replace the oil. - Preparation: Soaking potatoes in water and slicing meat thinly or cooking it for a short time can prevent excessive formation. - Cover with balance: Consuming foods rich in antioxidants, such as vegetables and fruits, can help suppress oxidative stress.

How to Incorporate into Daily Life and Priorities

There's no need to switch all meals to low-temperature cooking. It's easier to start by improving frequently used cooking methods (deep-frying or easily charred grilling that you eat multiple times a week). Since eating out and processed foods often involve high-temperature or prolonged heating, reducing their frequency or adding an extra vegetable dish are also effective strategies.

Summary

Choosing good quality ingredients is important, but cooking methods are equally crucial. High-temperature cooking creates aroma and texture but carries the risk of producing harmful substances like acrylamide, heterocyclic amines, PAHs, and COPs. While incorporating low-temperature cooking methods like steaming, boiling, and simmering into your daily routine, if you must grill or fry, you can reduce risks through preparation, marinating, oil selection, and shortening cooking times. Our geefee team has also felt that our family's meals have become a bit healthier since we started being mindful of these things in our daily cooking. Please try to incorporate these tips within a manageable scope.

Disclaimer: The information in this article is for general informational purposes only and does not constitute medical advice. Please consult a qualified healthcare professional before making any health-related decisions.