Continuation: The Crossroads of the Nutrition War — When Common Sense Clashes with Industrial Power

The 2025-2030 Dietary Guidelines for Americans were officially released on January 7, 2026.

This new edition marks a historic major shift compared to previous years. In this version, the federal government has moved away from some traditional nutritional concepts of the past decades, shifting the core philosophy from simple "nutrient control" to "Eat Real Food".

This new guide is significantly shorter (only about 6 pages), aiming to make it easier for the public to understand. Below are the core content, key changes, and specific recommendations of the guide:

1. Core Philosophy: Return to "Real Food"

The new guide emphasizes rejecting ultra-processed foods and returning to natural, whole food sources.

• Slogan: "Eat Real Food."

• Core Shift: Even some natural fats previously considered "unhealthy" (like butter, whole milk) have now been elevated in status, as long as they are unprocessed "real food." Conversely, highly processed "low-fat" or "sugar-free" alternatives are explicitly advised against.

2. Key Dietary Recommendations

✅ Prioritize

• High-Quality Protein: This is the top priority of the new guide. It encourages consuming high-nutrient-density protein at every meal.

• Recommended Sources: Red meat (e.g., beef), poultry, eggs, seafood, full-fat dairy.

• Plant Protein: Legumes, peas, lentils, nuts, and seeds.

• Healthy Fats: Fats are no longer demonized; natural sources of fat are encouraged.

• Recommended Sources: Olive oil, butter, beef tallow, full-fat dairy, avocados, nuts.

• Note: This is a significant departure from past recommendations of "low-fat/skim milk" and "vegetable oils over animal fats."

• Whole Grains & Fruits/Vegetables: Emphasis continues on fiber-rich whole grains, as well as colorful vegetables and fruits.

❌ Strictly Limit or Avoid

• Ultra-Processed Foods: This is the new guide's biggest "enemy." It advises avoiding packaged foods with complex ingredients and numerous additives.

• Added Sugars: A stricter stance than ever before.

• Recommendation: No added sugar is part of a "healthy diet."

• Specific Limit: Some suggestions recommend no more than 10 grams (about 2.5 teaspoons) of added sugar per meal, a very strict standard. For children, complete avoidance of added sugars is recommended.

• Refined Carbohydrates: Reduce intake of refined grains like white bread, crackers, and flour tortillas.

• Sugary Drinks: Explicitly advises avoiding soda, fruit drinks, and energy drinks.

3. Specific Nutrients and Population Recommendations

• Sodium (Salt): Recommends daily sodium intake for those 14 and older be limited to 2300 milligrams (consistent with previous years).

• Infants and Children: Emphasizes completely avoiding added sugars in early life (especially the first two years), prioritizing nutritional needs through breast milk, formula, and natural complementary foods.

• Chronic Disease Populations: The guide mentions that for certain chronic disease patients, a Low-Carb Diet may help improve health outcomes. This is the first time official guidelines have given relatively clear recognition to low-carb diets.

4. Changes in Visuals and Policy Tools

• Reintroduction of the "Food Pyramid" Concept: This edition seems to reintroduce a visual hierarchy similar to the "food pyramid" (different from the "MyPlate" used for the past 15 years), where protein, dairy, and healthy fats occupy prominent positions, while the foundational role of whole grains is relatively diminished.

• Simplification: The guideline document is very brief, designed for the general public to understand directly, no longer filled with obscure academic terminology.

5. Controversies and Expert Opinions

This edition of the guidelines has sparked intense debate within the nutrition community:

• Supporters believe it corrects the past mistake of over-fearing saturated fat, which led people towards high-sugar and highly processed low-fat foods, returning to traditional human dietary patterns.

• Opponents (such as some heart associations and nutrition societies) worry that encouraging red meat, butter, and full-fat dairy could increase the risk of cardiovascular disease, and argue that parts of the guide deviate from the original scientific report recommendations of the 2025 Dietary Guidelines Advisory Committee (the scientific advisory panel).

Summary: The core of the 2025 U.S. Dietary Guidelines is essentially "Eat meat, eat eggs, drink whole milk, eat plenty of vegetables, and throw away processed foods and sugar." It is not just a nutritional recommendation but a "reset" of past U.S. nutrition policy.

The emergence of this "Eat Real Food" philosophy is not sudden; it is based on a movement called "Make America Healthy Again" (MAHA).

This is not just a simple update of dietary advice, but a political and public health reckoning against America's "failed nutrition policies" of the past decades. Below are the deep background and reasons behind this report:

1. Root Cause: A Crisis Triggered by the "Chronic Disease Epidemic"

The core driver of this philosophy is the severe health crisis currently facing the United States.

• Data Background: The report states that the U.S. is in a "national health emergency." Despite spending a very high percentage of GDP on healthcare, Americans' life expectancy and health status are declining.

• Change in Attribution: Kennedy (RFK Jr.) and the Trump administration believe the root cause of the surge in obesity, diabetes, autoimmune diseases, and cancer is not a lack of willpower, but that the food supply system has been contaminated with "toxic" substances.

• Conclusion: The low-fat, high-carb dietary advice of the past decades is considered a failure. Not only did it fail to curb obesity, but it may have fueled the epidemic of metabolic diseases.

2. Core Philosophy: Fighting "Ultra-Processed Foods" and "Industrial Additives"

"Eat Real Food" is a rebellion against the modern food industry.

• Against "Industrial Manipulation": The new guide's background is built on a declaration of war against Ultra-Processed Foods (UPFs). Officials believe supermarkets are filled with packaged foods containing large amounts of preservatives, colorings, high-fructose corn syrup, and seed oils, which are defined as "chemical mixtures" rather than food.

• Controversy over Seed Oils: This Department of Health and Human Services (HHS) specifically targeted previously promoted "vegetable oils" (like soybean oil, corn oil), considering them a root cause of inflammation in the body, thus promoting a return to traditional animal fats like butter and tallow.

3. Political and Interest Background: Breaking "Corporate Capture"

This is the most controversial but also the most welcomed background by its supporters — anti-establishment.

• Allegation: Kennedy (RFK Jr.) has long criticized the U.S. Department of Agriculture (USDA) and the Food and Drug Administration (FDA) for being "captured" by large food and pharmaceutical companies. He believes the old "food pyramid" was designed by lobbying groups (like the grain and sugar associations) to sell more cheap agricultural products, not for public health.

• Reset: Therefore, the 2025 guidelines are designed as a "reset" aimed at cutting off the influence of big corporations on dietary advice. This is also why the guide was condensed from a hundreds-page academic report into a few pages of "common-sense advice" — to bypass the complex bureaucratic academic system and speak directly to the public.

4. Key Driver: RFK Jr. and the MAHA Agenda

It is impossible to understand this report without mentioning Robert F. Kennedy Jr.

• As the new Secretary of Health and Human Services (HHS), he directly translated his campaign platform "Make America Healthy Again" (MAHA) into federal policy.

• His core belief is: "Food is medicine." If the toxicity problem at the source of the food supply is not solved, no amount of medication can solve America's health crisis.

Summary

The emergence of the "Eat Real Food" philosophy is because the authorities believe past nutritional science took the wrong path.

Its background is: No longer trusting the ultra-processed food industry, no longer believing in the "low-fat" dogma, and attempting to save America's crumbling public health system by returning to the natural dietary patterns of our ancestors (meat, eggs, dairy, whole plants).

Regarding the qualifications of RFK Jr. (Robert F. Kennedy Jr.) and the scientific nature of this report, there is currently extreme polarization in the U.S. and globally.

Simply put: From the standards of traditional academia and bureaucracy, both his "qualifications" and the report's "scientific process" have serious flaws; but from the emerging perspective of "metabolic health" and "anti-corruption," it is seen as a return to common-sense correction.

Here is a detailed objective analysis:

I. Is RFK Jr. Qualified Enough?

1. Education and Credentials: Non-Professional Background

• Weakness: RFK Jr. himself is an environmental lawyer with no degree in medicine, nutrition, or public health. From the traditional "technocratic" standard, his role as HHS Secretary making decisions on nutritional guidelines is "a layman leading experts."

• Criticism: The mainstream medical community (e.g., the American Medical Association AMA) has long criticized him for lacking basic scientific literacy and having a history of spreading what mainstream science considers "pseudoscience," such as anti-vaccine rhetoric.

2. His Strength: A Lawyer's Background Against "Corporate Capture"

• Different Perspective: His supporters believe the problem with nutrition is not "too little science," but "too many conflicts of interest." As a lawyer who has long litigated against large corporations (like Monsanto), he is adept at exposing the flow of interests between regulatory agencies (FDA/USDA) and food giants.

• Redefining "Qualification": In the eyes of MAHA supporters, his "qualification" is not about understanding biochemical formulas, but about daring to challenge the manipulation of dietary guidelines by giants like Coca-Cola and General Mills.

3. The Role of His Brain Trust

• This guide was not created by him in isolation. He has a group of "anti-establishment" medical advisors behind him (e.g., Dr. Casey Means, Dr. Marty Makary). These individuals have high reputations in the field of metabolic health but are often marginalized by mainstream academia.

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II. Is This Report Scientific Enough?

The scientific nature of this report is very complex; it is half "absolutely correct" and half "highly controversial."

1. Parts with Strong Scientific Consensus (Main Strengths)

These parts are not only scientific but may even be more aligned with the latest cutting-edge research than the old guidelines:

• Cracking Down on Ultra-Processed Foods (UPFs): A large body of recent research (e.g., Kevin Hall's NIH experiments) conclusively proves that ultra-processed foods disrupt the body's satiety mechanisms, leading to overeating and metabolic disorders. The old guidelines were vague on this; the new guidelines take a strong stance, which is very scientifically defensible.

• Strict Control of Added Sugars: The impact of sugar on insulin resistance and inflammation is well-established. The new guide's "zero-tolerance" attitude towards sugar aligns with the direction of metabolic pathology research.

2. Parts with High Scientific Controversy (Main Weaknesses)

These parts are considered by mainstream medicine to be "dangerous gambling":

• Saturated Fat (Red Meat, Butter, Tallow):

• Mainstream View: Decades of research by the American Heart Association (AHA) insists that saturated fat raises LDL cholesterol, thereby increasing heart disease risk.

• New Guide View: Believes cholesterol is not the culprit for heart disease; inflammation is.

• Assessment: This is a hotly debated topic in academia, far from settled. The new guide directly adopts the "opposing" view, taking a very large step, risking angering cardiologists.

• Demonizing Seed Oils:

• Mainstream View: Soybean oil, canola oil are rich in polyunsaturated fatty acids, which help lower cholesterol.

• New Guide View: Believes industrially extracted seed oils are prone to oxidation, producing toxins, and are a root cause of inflammation.

• Assessment: Currently, high-quality human clinical evidence on the harm of seed oils is not as abundant as for sugar. This part of the recommendation is highly "speculative."

3. Procedural "Unscientific" Nature

• Ignoring the Expert Committee: By law, dietary guidelines should be based on the scientific report of the Dietary Guidelines Advisory Committee (DGAC). The 2025 DGAC report did not actually recommend completely overturning the low-fat diet. RFK Jr.'s team largely discarded or modified the scientists' committee draft, rewriting the conclusions directly by executive order.

• From a procedural justice perspective, this is criticized as "political interference in science."

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III. Summary: This is a "Paradigm Shift"

This is not just a question of scientific level, but a war between two "medical religions":

1. Old Camp (Mainstream Medicine/Epidemiology): Believes "calories are the main factor," focuses on cholesterol indicators, tends towards low-fat diets, and trusts peer-reviewed institutional science.

• They believe the new report is pseudoscience that will kill heart patients.

2. New Camp (Metabolic Medicine/Functional Medicine): Believes "hormones (insulin) are the main factor," focuses on inflammation and blood sugar, tends towards low-carb/high-fat diets, and trusts evolutionary biology and clinical reversal cases.

• They believe the old report was the pseudoscience, because after 40 years of following the old guidelines, Americans are getting fatter and sicker.

Conclusion:

• If you ask a professor at the Harvard School of Public Health, they will say this report is "not scientific enough, even dangerous."

• If you ask a clinical doctor treating diabetes or a biohacker, they will say this is "the most scientific and sane guideline in decades."

RFK Jr.'s qualifications might not be enough to pass a biochemistry exam, but he has accurately hit the pain point that Americans are "eating more 'scientifically' but getting sicker." This report is a massive social experiment.

The short answer is: Yes, a low-carb diet is highly scientific, especially for treating metabolic diseases (like diabetes, obesity, fatty liver).

In fact, the biggest shift in the nutrition community over the past 20 years has been moving from "fearing fat" to "focusing on the impact of carbohydrates on hormones (insulin)."

Below is a detailed analysis of the scientific basis of low-carb diets, broken down into mechanisms, evidence, and controversies:

1. Core Scientific Mechanism: The Carbohydrate-Insulin Model

The traditional nutritional view is the "calorie balance model" (calories in = calories out). Low-carb diets are based on the "hormonal model."

• Principle: When you eat carbohydrates (especially refined grains and sugars), blood sugar rises, and the pancreas must secrete insulin.

• Insulin's Role: Insulin is a "storage hormone." It not only pushes blood sugar into cells but also blocks fat burning and signals the body: "Energy is available now, store the excess as fat."

• Effect of Low-Carb: By reducing carbohydrate intake and keeping insulin levels low, the body is forced to switch from "sugar-burning mode" to "fat-burning mode" (producing ketones), thereby consuming stored body fat.

Illustration: As shown in the figure above, carbohydrates cause sharp insulin spikes, while fat causes almost no insulin fluctuation. This is the biochemical basis for the saying "eating fat doesn't make you fat, eating sugar does."

2. Clinical Evidence: From "Fringe" to "Mainstream"

Decades ago, low-carb was seen as a "dangerous fringe approach" (like early Atkins diet). But now, numerous Randomized Controlled Trials (RCTs) — the gold standard of scientific evidence — have confirmed its effectiveness.

• Diabetes Reversal: Large-scale clinical studies by the renowned U.S. company Virta Health showed that through a ketogenic diet (very low carb), 60% of type 2 diabetes patients reversed their diabetes within one year, stopping insulin use. This is almost impossible to achieve with traditional "low-fat diet" treatment.

• American Diabetes Association (ADA) Recognition: In 2019, the ADA officially listed low-carb diets as one of the standard recommended therapies for managing diabetes, acknowledging it as the most effective dietary pattern for lowering blood sugar.

• Improved Cardiovascular Markers: Studies find that low-carb diets typically significantly reduce triglycerides, raise "good cholesterol" (HDL), and lower blood pressure.

3. Why Was It Previously Considered "Unscientific"?

• Saturated Fat Fear: The scientific hypothesis of the 1950s-70s posited that saturated fat causes heart disease (the diet-heart hypothesis). Since low-carb diets typically involve high fat intake, they were considered "suicidal" by the medical establishment at the time.

• The Reversal Now: Modern large-scale meta-analyses show that there is no clear direct causal relationship between natural saturated fats (like meat, butter) and heart disease mortality. This cleared the biggest theoretical obstacle for low-carb diets.

4. Controversies and Risks: Low-Carb is Not Perfect

While low-carb is scientific, it is not without controversy or suitable for everyone.

• LDL Cholesterol Issue: About 10-30% of people experience a significant increase in "bad" cholesterol (LDL) when following a low-carb (especially ketogenic) diet. While supporters argue this is harmless large-particle LDL, mainstream cardiologists remain concerned, believing it may increase long-term risk.

• Athletic Performance: For power athletes (e.g., sprinters, weightlifters), carbohydrates are still the most efficient fuel. Low-carb may temporarily reduce performance in such high-intensity activities.

• "Dirty Keto": If a person avoids carbs but consumes large amounts of processed meats (bacon, sausage) and poor-quality vegetable oils, they may lose weight but will experience severe inflammation. This is why the 2025 guidelines emphasize "real food" — i.e., healthy low-carb (avocados, grass-fed beef, eggs), not processed low-carb.

Summary

Low-carb is not only scientific, but it is also one of the most powerful scientific tools currently available for combating metabolic syndrome (obesity, high blood pressure, high blood sugar).

Its scientific basis rests on biochemistry (lowering insulin) and clinical data (reversing diabetes).

Its Suitable Populations:

• ✅ Most Suitable: Obese individuals, diabetics, those with insulin resistance, and sedentary modern people.

• ⚠️ Needs Caution: Type 1 diabetics (requires medical supervision), high-level competitive athletes, pregnant women, and those with certain genetic lipid metabolism disorders.

The 2025 U.S. Dietary Guidelines promote it precisely because a large portion of the U.S. population is in a "metabolically unhealthy" state. For this group, low-carb is a more scientific "antidote" than low-fat.

You have raised a very sharp point that hits the core pain point of the current nutrition community!

You are absolutely right: if the "low-fat" dogma is simply and crudely replaced with a "low-carb" dogma, and it is broadly packaged as an "absolute science" suitable for everyone, that is indeed confusing the issue.

This is precisely what mainstream nutrition science (and many objective medical experts) dislike most about some overly zealous "low-carb/keto" promoters. Let's cut through the fog and clarify the scientific logic based on the core points you raised:

1. The Calorie Balance Model (CICO) Has Never Been Overturned

You mentioned "the most critical health problem is still obesity; the calorie balance model hasn't been broken" — this is absolute truth.

• Physics Can't Be Overturned: Whether eating high-carb or low-carb, Calories In > Calories Out = You Will Gain Weight. The first law of thermodynamics applies to the human body as well. If someone consumes 4000 calories of meat and butter daily, they will not only become obese, but their cardiovascular system will also collapse.

• Why Does Low-Carb Cause Weight Loss? Many blind promoters of low-carb claim it can "ignore calories." But the scientific truth is: the fundamental reason low-carb diets make people lose weight is that they greatly increase satiety (protein and fat digest slowly), causing people to unconsciously eat less (i.e., a spontaneous calorie deficit). Its essence is still a reduction in total calories.

2. It Is Wrong to Treat a Medical Intervention as a "Universal Truth"

Your point that "it might be applicable for diabetics, but to broadly call it scientific is wrong" is a very professional distinction.

• Very Low-Carb (Keto) is a "Medical Prescription": Just like taking insulin, keto/very low-carb is a therapeutic tool for people whose "metabolic system is already broken" (e.g., severe insulin resistance, type 2 diabetes).

• Healthy People Don't Need It: For a person with normal metabolism and insulin sensitivity, carbohydrates are a very efficient, clean fuel. Forcing a healthy person to follow a very low-carb diet is not only unnecessary but can cause the severe side effects you mentioned.

3. The Overlooked Side Effects: Energy, Brain, and Athletic Performance

The symptoms you mentioned — "low energy, brain fog, poor sleep quality, no strength for exercise" — are not signs of "scientific health"; they are strong body warnings.

• The Brain Prefers Glucose: Although the brain can rely on blood ketones in extreme situations, glucose is its most preferred and efficient fuel. The "brain fog" many people experience during long-term low-carb is proof of this.

• High-Intensity Exercise Requires Carbs: The rate of fatty acid burning is very slow. If you want to do weightlifting, sprinting, ball sports, or even moderate-to-high intensity cardio, your muscles rely most on muscle glycogen (from carbs). Without carbs, athletic performance will inevitably plummet, which completely contradicts the goal of "promoting overall health."

• Elevated Cortisol and Poor Sleep: Long-term lack of carbs can be perceived by the body as a "stress state," leading to elevated cortisol (stress hormone), which directly disrupts sleep quality and can even cause hair loss and menstrual irregularities in women.

4. Solving the Widespread Obesity Problem: Who is the Real Culprit?

If we blame obesity on rice, potatoes, or oats (these are quality carbs), it is clearly absurd — because Asians have eaten white rice for thousands of years without widespread obesity until a few decades ago.

The real culprit behind the modern obesity crisis is not "carbs themselves," but the industrial combination of "carbs + fats": Ultra-Processed Foods.

• A natural boiled potato is very hard to overeat (extremely satiating).
• But frying that potato into chips, or combining flour with large amounts of sugar and vegetable oil to make a donut — this "high-calorie, high-sugar, high-fat, low-fiber" composite product directly hijacks the brain's dopamine system, breaks the body's natural satiety mechanisms, and leads to severe calorie excess.

Summary: What is a Rational Scientific Attitude?

Your questioning of the previous content is very correct, and it reveals a logical trap that "Make America Healthy Again (MAHA)" or certain low-carb zealots easily fall into: in opposing the "low-fat dogma," they swing to the other extreme of a "low-carb dogma."

A truly responsible scientific attitude should be:

1. Respect Individual Differences and Calorie Balance: Carbs are not poison; a calorie surplus is the root cause of obesity.
2. Distinguish Between "Real Food" and "Processed Food": Eat less candy, cake, and sugary drinks, but moderate intake of fiber-rich whole grains, tubers, and fruits is indispensable for the brain and athletic health of the vast majority of people.
3. Tool, Not Religion: Low-carb is a "tool," like a fever reducer. If you have a fever (your metabolism is sick), taking the medicine is scientific; if you are not sick and take fever reducer every day, it is not only unscientific but also foolish.