Key Takeaways
  • Processed foods often contain additives that warrant caution, with sodium nitrite, caramel color, artificial colorings, trans fats, and aspartame being common concerns.
  • Sodium nitrite is used for color and preservation in processed meats and has been linked to carcinogenicity (including evaluations by the WHO's International Agency for Research on Cancer and multiple epidemiological studies).
  • 4-MEI found in caramel color and some artificial colorings have shown issues in animal studies, requiring caution.
  • As legal regulations for trans fats in Japan are not strict, checking labels and actively avoiding them is an effective strategy.
  • When shopping, check the top ingredients listed, and choosing less processed foods, those labeled "additive-free," or products with fewer ingredients is a practical approach.

Introduction: Ingredient Labels are Your Health Guide

We've all been there – standing in the supermarket, jacket or package in hand, scrutinizing the ingredient list and wondering, "What on earth is that name?" Processed foods are convenient, but if we eat them regularly over time, they can often contain additives we might be concerned about. In this article, from GEEFEE's perspective, we'll clearly explain the "Top 5 Additives to Watch Out For" that are commonly found. By the time you finish reading, you'll have a clear idea of what to check for when you shop.

1. Sodium Nitrite (Common in Processed Meats)

Caution Level: ★★★★★

Sodium nitrite is used in processed meats like ham, bacon, and sausages for color and preservation. It can react with amines in the body to form nitrosamines, and these nitroso compounds have been linked to an increased risk of cancer. The International Agency for Research on Cancer (IARC) of the World Health Organization (WHO) classifies processed meat itself as "carcinogenic to humans (Group 1)," and epidemiological studies, such as a 2011 meta-analysis (Chan et al.), have suggested a link to colorectal cancer. When we used to eat processed meats several times a week, we noticed that our digestive health improved when we consciously reduced our frequency.

How to Avoid It

We recommend reducing your intake of processed meats, choosing products labeled "uncured" (nitrite-free) or those with fewer ingredients, and opting for chicken breast or legumes as protein alternatives.

2. Colorings: Food Tar Dyes and Caramel Color

Food Tar Dyes (Artificial Colorings) — Caution Level: ★★★☆☆

Artificial colorings are widely used in sweets, beverages, and processed foods. Some studies in animals have shown an increase in thyroid tumors and behavioral effects (link to hyperactivity), and their impact on children is often highlighted. However, direct evidence of carcinogenicity in humans is limited, and regulations and approvals vary by country. When we compared the ingredients of commercially available sweets, we noticed an increasing number of products that achieve color without using artificial colorings.

Caramel Color — Caution Level: ★★★★☆

Caramel color, found in sodas, sauces, and soy sauce, can contain byproducts formed during heating, such as 4-methylimidazole (4-MEI), which has been linked to carcinogenicity in animal studies. Concerns about these have been reported since the 2000s, leading to evaluations and efforts to reduce them in various countries. While completely avoiding it might be difficult, it's effective to limit your daily intake of large quantities of dark-colored processed beverages and sauces.

3. Trans Fats and Artificial Sweeteners (Aspartame)

Trans Fats — Caution Level: ★★★★☆

Trans fats are a concern in margarine, some baked goods, and frying oils, with clear evidence linking them to an increased risk of cardiovascular disease. The World Health Organization strongly recommends reducing intake, but in Japan, legal regulations are more lenient compared to Western countries, and much relies on voluntary corporate action. We've become more careful about checking for "0g trans fat" labels on packages (though even 0g can sometimes contain trace amounts depending on labeling standards).

Aspartame (Artificial Sweetener) — Caution Level: ★★★☆☆

Aspartame is a low-calorie sweetener used in many diet drinks and chewing gums. While some evaluations support its safety at typical intake levels, caution is advised for individuals who experience headaches or digestive symptoms, and for those with phenylketonuria. Furthermore, more research is being conducted on the long-term metabolic and gut microbiota effects of artificial sweeteners, and some aspects are still inconclusive. When we tried it ourselves, we found that our craving for sweetness subsided after reducing our intake of beverages containing artificial sweeteners.

4. How to Read Labels and Practical Avoidance Strategies

Points to Check

- Check if there are suspicious names (like sodium nitrite, aspartame, various colorings, partially hydrogenated oil, etc.) at the beginning of the ingredient list. - Look for labels like "additive-free," "preservative-free," or "no artificial colors," but also check the ingredient list as the meaning of these labels can vary by product. - Choose less processed foods (fresh, unprocessed frozen, or canned goods with minimal ingredients).

Everyday Tips

- Limit processed meats to once a week or less, and use homemade seasonings or additive-free alternatives. - Reduce the frequency of snacks and soft drinks, substituting them with fruits, nuts, or unsweetened yogurt. - What we actually tried was "comparing ingredients within the same category." We often found surprisingly simple ingredients even in inexpensive products.

Summary

Among the additives found in processed foods, some can pose health risks with repeated consumption. Sodium nitrite, caramel color (4-MEI), artificial colorings, trans fats, and aspartame are prominent examples to watch out for. However, "completely avoiding everything" isn't realistic, so even practical measures like reducing frequency, checking labels, and incorporating alternative foods can lower your risk. We also feel that by making small changes in our daily shopping, we can reduce additives while maintaining satisfaction with our diet.

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.