On any given evening in Sydney, someone is pouring canola oil into a pan for a stir-fry, while a few suburbs over a small boutique is rendering beef fat into jars labelled "beef dripping". Both choices are now a statement. In 2026 the argument over whether seed oils poison us has migrated from a niche corner of nutrition Twitter to the top of the US food pyramid, and Australian consumers, regulators and a small herd of tallow start-ups are now weighing the evidence in their own kitchens.

A debate that turned into policy

The shift happened fast. In January 2026, RFK Jr., now US Health Secretary, released the Dietary Guidelines for Americans 2025-2030, branded "Real Food" and hosted at realfood.gov [1]. For the first time, official US guidance elevates butter and beef dripping as "healthy fats" and "real foods", places protein and full-fat dairy at the top of a new pyramid, and tells Americans to avoid highly processed food; it also drops the long-standing recommendation limiting alcohol [1][2]. Sarah Berry in the Sydney Morning Herald noted that two-thirds of the external guideline reviewers had ties to the beef, dairy or pork industries, and that the document keeps the 10% saturated-fat cap while naming butter and tallow as healthy, a tension the panel did not resolve [2][3].

An Associated Press investigation found that RFK Jr. had publicly claimed Americans are being "unknowingly poisoned" by seed oils and had called for fast-food chains to return to beef dripping in their fryers [4]. Wellness influencers, who label canola, soybean and corn oil "the hateful eight", say they drive inflammation, obesity and diabetes; an International Food Information Council survey found many Americans now avoid them [4].

What the cohort data actually shows

The most-cited recent US evidence is a 33-year pooled analysis of 221,054 adults in the Nurses' Health Study, the Health Professionals Follow-Up Study and Nurses' Health Study II, published in JAMA Internal Medicine in March 2025 by Yu Zhang and colleagues at Harvard T.H. Chan [5][6]. Higher butter consumption tracked with higher all-cause and cancer mortality; higher plant-oil consumption (canola, olive, soybean, safflower, corn) with lower all-cause, cancer and cardiovascular mortality. Swapping 10 g a day of butter for plant-based oil was associated with a 17% lower risk of premature death and a 17% lower risk of cancer death [5][6].

Older evidence sits underneath. The 2014 Farvid meta-analysis in Circulation pooled 13 prospective cohort studies, roughly 310,000 participants and 12,500 coronary events, and found higher versus lower dietary linoleic acid intake associated with a 15% lower risk of CHD events (pooled RR 0.85) and a 21% lower risk of CHD death (pooled RR 0.79); replacing 5% of energy from saturated fat with linoleic acid was associated with a 9% lower CHD event risk and a 13% lower CHD death risk [7]. The 2021 AHA Scientific Statement, led by Alice Lichtenstein at Tufts, recommended replacing saturated fat (butter, lard, beef dripping, palm and coconut oil) with polyunsaturated and monounsaturated plant oils, with a population target of 5 to 6% of energy from saturated fat, or under 7% for those at CVD risk [8]. PREDIMED, the 2013 Spanish RCT of 7,447 high-risk participants, was stopped early for benefit, with about a 30% relative reduction in major cardiovascular events in both Mediterranean arms versus a low-fat control [9]. A 2023 WHO PUFA review reached a similar conclusion [10].

Where the critics have a point

The most uncomfortable counter-evidence is the 2016 Ramsden re-analysis in the BMJ of recovered raw data from the Minnesota Coronary Experiment (1968-73), a double-blind RCT of 9,423 Minnesota nursing home and mental hospital residents [11]. Serum cholesterol fell 13.8% in the intervention group versus 1.0% in controls, yet no mortality benefit appeared; each 30 mg/dL (0.78 mmol/L) reduction was associated with a 22% higher risk of death (HR 1.22; 95% CI 1.14-1.32) [11]. A pooled meta-analysis of five similar older RCTs (n=10,808) found no benefit on CHD mortality (RR 1.13; 95% CI 0.83-1.54), and the authors concluded that incomplete publication has likely overstated the benefits of swapping saturated fat for linoleic-acid-rich vegetable oils [11].

The legitimate concern is less linoleic acid at typical intakes (2 to 10% of energy) than the oxidation products that form when omega-6 rich oils are heated: 4-HNE, 9- and 13-HODE, and other reactive aldehydes [12][13]. A 2024 Lipids in Health and Disease review argues the omega-6 to omega-3 ratio is a less useful indicator of cardiometabolic risk than absolute intakes, and that linoleic acid at typical dietary intakes does not meaningfully raise systemic inflammation in humans [13]. The worry about deep-frying cheap vegetable oil at high heat is not pseudoscience. The worry about a canola-based stir-fry at home almost certainly is.

Beef tallow: chemistry, history and a comeback

Rendered beef fat is roughly 55% saturated fat, butter roughly 57% [2]. The dominant fatty acid in tallow is palmitic acid, which Rosemary Stanton and others note raises LDL cholesterol almost as much as trans fat does, despite claims that tallow's high stearic acid content makes it benign [2]. The 10% saturated-fat cap common to Australian and US guidelines equals about 50 g a day, roughly 3.5 tablespoons of butter or tallow [2]. McDonald's switched from beef tallow to vegetable-oil blends in the 1990s, and the 1950s and 60s meat-and-full-fat-dairy pattern the new US pyramid harks back to coincided with very high heart disease rates [2][4].

That history has not stopped the tallow comeback. Australian boutique brands Yello and Tallow & Co sell rendered beef fat as an "ancestral" cooking medium; in the US, Epic Beef and Fatworks pitch beef dripping as a clean alternative to industrial seed oils [2]. Martha Belury at Ohio State, quoted in the Associated Press piece, captured the bafflement many nutrition scientists feel: "I don't know where it came from that seed oils are bad" [4]. Jemma O'Hanlon, CEO of Foodwatch, told the Sydney Morning Herald:

"Butter and beef tallow are unhealthy fats, full stop. We know from strong science that too much saturated fat increases our risk of heart disease."

Berry added a useful line for anyone still clinging to the idea that dripping-fried chips are a health food:

"Fries cooked in beef dripping are no healthier than fries cooked in seed oil, they're still deep-fried." [2]

For Australian shoppers weighing the boutique aisles, Elena George at Deakin and Evangeline Mantzioris at Adelaide have long recommended extra-virgin olive oil, avocado, macadamia and oily fish as the practical substitutes [2].

Australia's canola advantage

The Australian angle is genuinely interesting. The country is, in effect, a natural experiment in a high-polyunsaturated, low-saturated cooking fat. Australian canola oil, a Brassica napus variety bred for low erucic acid and low glucosinolates, is the country's largest oilseed crop and dominant cooking oil, with roughly 60% monounsaturated oleic acid, 20% polyunsaturated linoleic acid, 9 to 11% alpha-linolenic acid, and only about 7% saturated fat, lower than olive, soybean or sunflower oils [14]. Its high smoke point (around 210 to 230°C) and neutral flavour explain its dominance in home kitchens and commercial fryers [14].

The Australian Dietary Guidelines, being revised for 2026, retain the 10% saturated-fat cap and emphasise whole foods; Mantzioris, on the working committee, has noted that the "eat whole foods" message of the new US pyramid is not new in Australia [2][3]. Less than 7% of Australians meet the guidelines, and roughly 66% of adults are overweight or obese [3]. The 2025-2030 US guidelines have diverged sharply, elevating tallow and butter and dropping the alcohol warning, in a heavily industry-linked process [2][3]. Michael Greger: "The new food pyramid is simply bananas. If nutrition guidelines were medicine, this would be malpractice." [3]

A pragmatic verdict

The strongest contemporary evidence still favours replacing saturated fat (butter, tallow, palm oil, coconut oil) with polyunsaturated and monounsaturated plant oils for cardiovascular and all-cause mortality, and the Zhang 2025 cohort and Farvid 2014 meta-analysis are the most defensible single numbers to quote. The legitimate concerns are about high-heat degradation products of polyunsaturated oils, not about canola in a salad dressing or a low-to-medium-heat pan.

Keep saturated fat under about 10% of energy. Use any oil, including tallow, sparingly when deep-frying, and treat boutique tallow with the scepticism its marketing deserves. The new US pyramid is a political document as much as a scientific one, and the boutique tallow trade is, on the evidence, more a marketing story than a nutrition one.