Roundup: Even Small Amounts of Processed Meats, Sugary Drinks Raise Health Risks Over Time; and More News

There are No Safe Amounts of Processed Foods, Sugary Drinks, and Trans Fats Consumed Regularly, New Research Finds

A comprehensive new study has provided stronger estimates of how certain processed foods and additives can raise the risks of chronic disease – even in “small amounts”  consumed over time.

Published in Nature Medicine, the analysis found that habitual consumption of even modest intakes of processed meats, sugar-sweetened beverages (SSBs), and trans fatty acids (TFAs) is associated with increased risks of type 2 diabetes, ischemic heart disease, and colorectal cancer.

While prior studies have long warned of health dangers linked to these foods, this research uses more advanced statistical methods to quantify how specific consumption levels affect disease outcomes. The study underscores the importance of dietary moderation and public health efforts aimed at reducing consumption of ultra-processed foods.

Key Findings: Even Small Amounts May Raise Risk

Using Burden of Proof meta-regression, a statistical method that adjusts for study quality and consistency, researchers examined associations between food intake and three major chronic diseases. Their findings offer a conservative but important estimate of how diet affects health risk.

1. Processed Meats

Processed meats include foods like bacon, sausages, hot dogs, and deli meats that have been preserved by smoking, curing, or adding salt and chemical preservatives.

• Consumption range analyzed: 0.6 to 57 grams per day
• Linked to:
• 11 percent average increase in type 2 diabetes risk
• 7 percent average increase in colorectal cancer risk

These increases were calculated relative to zero consumption, indicating that even small amounts may contribute to disease risk.

2. Sugar-Sweetened Beverages (SSBs)

SSBs refer to drinks like sodas, energy drinks, and sweetened juices containing added sugars.

• Consumption range analyzed: 1.5 to 390 grams per day
• Linked to:
• 8 percent average increase in type 2 diabetes risk
• 2 percent increase in ischemic heart disease (IHD) risk

Ischemic heart disease occurs when narrowed arteries reduce blood flow to the heart, often leading to chest pain or heart attacks.

3. Trans Fatty Acids (TFAs)

TFAs are industrially produced fats found in some baked goods, fried foods, margarine, and packaged snacks. Though banned or restricted in many countries, they still appear in some global food supplies.

• Consumption range analyzed: 0.25 percent to 2.56 percent of daily energy intake
• Linked to: 3 percent average increase in ischemic heart disease risk

Lead researchers emphasized that although the associations are not classified as “strong,” the high prevalence of these foods in modern diets—and the global burden of the related diseases—warrants continued caution.

Why This Matters

These findings reinforce long-standing dietary recommendations: Limit processed meats, sugary beverages, and trans fats as part of a strategy to reduce chronic disease risk.

While the risk increases may appear modest (for example: 7–11 percent), the impact becomes substantial at the population level, especially when considering the cumulative effect of daily consumption over many years.

Health experts continue to advocate for:

• Replacing processed meats with lean protein sources like fish, beans, or poultry
• Substituting water or unsweetened beverages for sugary drinks
• Avoiding products with partially hydrogenated oils, a common source of industrial TFAs

Hormone Therapy Linked to Breast Cancer Risk in Younger Women, NIH Study Reveals

A new study by the National Institutes of Health (NIH) focuses on the link between hormone therapy and breast cancer risk in women under the age of 55. The findings, based on data from over 459,000 women worldwide, indicate that the type of hormone therapy a woman uses can significantly influence her risk of developing breast cancer.

This research may help guide more personalized treatment decisions for younger women undergoing hormone therapy.

Hormone therapy is commonly prescribed to alleviate menopausal symptoms such as hot flashes, night sweats, and mood changes. It is also used in women who have undergone surgical procedures like hysterectomy (removal of the uterus) or oophorectomy (removal of the ovaries), which can trigger early menopause by disrupting natural hormone production.

The study focused on two major types of hormone therapy:

• Unopposed Estrogen Hormone Therapy (E-HT): This involves administering estrogen alone and is recommended only for women who have had a hysterectomy. This is because using estrogen alone in women with an intact uterus increases the risk of uterine cancer.
• Estrogen Plus Progestin Hormone Therapy (EP-HT): This combines estrogen with progestin (a synthetic form of the hormone progesterone) and is typically used in women who still have their uterus, as it helps counterbalance estrogen’s effect on the uterine lining.

Key Findings: Breast Cancer Risks Vary by Therapy Type

The researchers found that the risk of developing breast cancer before age 55 differs significantly depending on the type of hormone therapy used:

• E-HT was associated with a 14 percent lower risk of breast cancer, compared to women who had never used hormone therapy. The protective effect was strongest in women who began E-HT at a younger age or used it for a longer duration.
• EP-HT was linked to a 10 percent increased risk of breast cancer, with the risk rising to 18% among women who used it for more than two years.

To put these numbers in perspective:

• The estimated breast cancer risk before age 55 was:
• 3.6 percent for E-HT users,
• 4.1 percent for non-users,
• 4.5 percent for EP-HT users.

These findings emphasize the need for individualized risk assessment when choosing hormone therapy, particularly for younger women.

Surgical History Matters

Another important insight from the study was the impact of gynecological surgeries on breast cancer risk. Women who had not undergone hysterectomy or oophorectomy and used EP-HT had a notably higher risk of developing breast cancer. This suggests that a woman’s surgical history should be carefully considered when evaluating the benefits and risks of hormone therapy.

“These findings underscore the need for personalized medical advice when considering hormone therapy,” said Dale Sandler, M.D., senior author and scientist at the NIH’s National Institute of Environmental Health Sciences (NIEHS), in a news release. “Women and their health care providers should weigh the benefits of symptom relief against the potential risks, especially when it comes to EP-HT.”

Lead author Katie O’Brien, M.D. added, “Our study provides greater understanding of the risks associated with different types of hormone therapy, which we hope will help patients and their doctors develop more informed treatment plans.”

Researchers Link Air Pollution to Higher Risk of Lung Cancer in Non-Smokers

Lung cancer has long been associated with tobacco use, but a recent study has shed light on an alarming trend affecting non-smokers. The new study found that environmental factors, such as air pollution and traditional herbal medicines, are contributing to genetic mutations that may lead to lung cancer in individuals with little to no smoking history.

The findings highlight the growing need to address air quality and other environmental exposures as major global health concerns, the researchers emphasize.

While smoking remains the primary cause of lung cancer, cases in individuals who have never smoked are on the rise. According to the study, this upward trend is particularly noticeable in women and those of East Asian heritage. The researchers -- led by teams from the University of California San Diego and the National Cancer Institute (NCI), part of the National Institutes of Health (NIH) -- used cutting-edge genomic techniques to identify specific links between environmental exposures and the genetic changes responsible for lung cancer.

The study’s authors say the findings offer genomic evidence, not just epidemiological data, to explain this phenomenon. This represents a major step forward in understanding why non-smokers, especially those who live in pollution-heavy areas, are increasingly being diagnosed with lung cancer, the researchers state.

What the Research Found

The research team analyzed lung tumors from 871 non-smokers across 28 global regions varying in air pollution levels. Using whole-genome sequencing, they identified “mutational signatures.” These are unique patterns of DNA damage that act as a molecular record of past harmful exposures. For example, cells exposed to smoking or aging often show distinct, recognizable mutational patterns.

Individuals in areas with higher air pollution had more genetic mutations in their lung tumors. Specifically, they had a 3.9-fold increase in a smoking-related mutational signature and a 76 percent rise in a signature tied to the natural aging process. This demonstrates that air pollution triggers DNA damage that aligns with known cancer-causing pathways.

The study also noted a "dose-response relationship," meaning the greater the pollution exposure, the more severe the genetic damage. These tumors exhibited shorter telomeres, the protective endcaps of chromosomes. Shortened telomeres are often a sign of cellular aging, which can also drive cancer development.

Telomeres are protective structures at the ends of chromosomes, often compared to the plastic tips of shoelaces that prevent fraying. Over time, as cells divide, telomeres gradually shorten. Accelerated telomere shortening, like that observed in pollution-exposed tumors, is linked to aging and a heightened risk of cancer.

Mutational signatures are unique patterns of DNA mutations that reveal the cause of genetic damage. For instance, smoking leaves a distinct “fingerprint” in DNA that researchers can identify. Similarly, pollution prompts damage that mirrors these mutational patterns, providing insights into the genetic drivers of disease.

The Role of Secondhand Smoke

The study found that secondhand smoke had a smaller genetic impact on non-smokers compared to air pollution. Although tumors in individuals exposed to secondhand smoke showed slightly higher mutation rates and shortened telomeres, they lacked specific driver mutations and distinct mutational signatures seen in pollution-exposed tumors.

This finding does not downplay the health risks of secondhand smoke, which remains a known contributor to cancer and other diseases, the study points out. However, the data suggest that its direct mutagenic (mutation-causing) effects on lung DNA are less pronounced than the effects of long-term air pollution exposure.