New Dietary Guidelines for Americans: What the Science Supports—and What It Gets Wrong
- Nichole Dandrea-Russert
- Jan 8
- 7 min read
Updated: Jan 9
✅ The new Dietary Guidelines get some things right: They encourage whole foods and recommend limiting added sugar and ultra-processed foods—both well supported by evidence.
⚠️ The biggest concern is what’s being emphasized: Full-fat dairy, butter, and red meat are positioned as core “healthy” foods despite strong evidence linking high saturated fat and red/processed meat intake to increased cardiometabolic risk.
🥩 More protein isn’t automatically better: While some people benefit from higher protein intakes, most Americans already meet protein needs. What’s missing is fiber—over 95% of Americans don’t get enough.
🌱 Protein quality matters: Replacing red and processed meat with plant-based protein is consistently associated with better health outcomes and longer lifespan. Plant proteins come with fiber; animal proteins do not.
🧈 Saturated fat matters: Butter and full-fat dairy raise LDL cholesterol and are linked to higher risk of heart disease. Replacing saturated fat with unsaturated plant fats improves cardiometabolic outcomes.
🥦 Fresh isn’t the only healthy option: Frozen and canned fruits and vegetables (without added sugar or excess sodium) are nutritious, affordable, and accessible—and should absolutely count.
🌾 Carbohydrates are broader than bread: Whole grains, starchy vegetables, beans, peas, and lentils provide fiber-rich complex carbohydrates that support gut health, steady energy, and brain function.
❤️ What the strongest evidence supports: A plant-forward, fiber-rich eating pattern—with limited red and processed meat, minimal butter and full-fat dairy, and an emphasis on whole plant foods—offers the best protection for heart, metabolic, and long-term health.
The newly released Dietary Guidelines for Americans have sparked conversation across the nutrition and public health world. While the guidelines make progress in some important areas—such as reducing added sugar and ultra-processed foods—other recommendations raise serious concerns when examined through the lens of long-standing, high-quality nutrition research.
As a registered dietitian specializing in cardiometabolic health, gut health, and mood, my goal is not to sensationalize the guidelines, but to clearly distinguish what is well-supported by evidence from what may increase chronic disease risk at a population level.
What the New Dietary Guidelines Get Right
Let’s start with what deserves recognition.
The guidelines appropriately emphasize:
Whole, minimally processed foods (this has always been the recommendation)
Reducing added sugar (also not new)
Limiting ultra-processed foods, artificial flavors, and additives (the new guidelines put more of an emphasis on this)
These recommendations are supported by a robust body of evidence and align with disease prevention, metabolic health, and overall well-being.
Where the Evidence Falls Short
1. Protein: More Isn’t Always Better—Quality Matters More Than Quantity
One of the most striking changes in the new guidelines is the recommendation for 1.2–1.6 grams of protein per kilogram of body weight per day, 50–100% more than the long-standing adult RDA of 0.8 g/kg.
Higher protein intakes may be appropriate for some populations—such as older adults, athletes, and peri- or postmenopausal women.
However, applying this higher target broadly ignores an important reality:
Most Americans already meet or exceed protein needs. What they don’t meet—by a wide margin—is fiber.
More than 95% of Americans fail to meet fiber recommendations, a shortfall strongly associated with increased risk of cardiovascular disease, type 2 diabetes, obesity, and certain cancers, alongside digestive issues like constipation and diverticular disease.
This is where protein quality becomes essential.
Why protein source matters
Large observational studies consistently show that replacing red and processed meat with plant-based protein is associated with:
Lower all-cause mortality
Improved cardiometabolic outcomes
Greater longevity
Plant proteins—such as beans, lentils, tofu, tempeh, and whole grains—come packaged with fiber and phytonutrients that reduce inflammation and support gut health.
In contrast, animal-based proteins like meat, dairy, and eggs contain zero fiber and minimal phytonutrients. This distinction has profound implications for long-term public health.
2. Saturated Fat, Animal Foods, and Chronic Disease Risk
The guidelines classify full-fat dairy and red meat as “whole, healthy, nutritious foods.”
This framing conflicts with decades of evidence showing that:
Saturated fat raises LDL (“bad”) cholesterol
Replacing saturated fat with unsaturated fats lowers cardiovascular risk
Processed meat is classified as carcinogenic, and red meat as probably carcinogenic by the World Health Organization and the International Agency for Research on Cancer
Dietary patterns high in saturated fat and red or processed meat are also associated with:
Increased risk of type 2 diabetes
Higher rates of colorectal, breast, and prostate cancer
Less favorable gut microbiome patterns
Emerging links to cognitive decline and dementia in observational studies
While nutrition science is complex, the most consistent finding is this: replacing saturated fat from animal foods with unsaturated fat from plants improves health outcomes.
3. Fruits and Vegetables: Fresh Isn’t the Only Healthy Option
It’s encouraging to see fruits and vegetables emphasized—but the language prioritizing fresh produce alone is limiting and unrealistic.
Frozen and canned fruits and vegetables (without added sugar or excess sodium):
Are nutritionally comparable to fresh
Are often frozen shortly after harvest, preserving nutrients
Are more affordable and accessible for many households
Freezing is a form of processing—but in this case, it’s one that supports nutrition, not detracts from it.
4. Whole Grains—and the Missing Conversation About Carbohydrates
The guidelines correctly encourage whole grains over refined grains. However, the framing—especially visually—feels overly narrow and reinforces the misconception that carbohydrates primarily mean bread and oatmeal.
Whole grain bread and oats can certainly be healthy options, but fiber-rich carbohydrates extend far beyond bread and oatmeal.
Whole, complex carbohydrate sources include:
Whole grains: quinoa, farro, barley, buckwheat, bulgur, millet (many of which also provide quality protein)
Starchy vegetables: sweet potatoes, purple potatoes, squash, corn
Legumes: beans, peas, and lentils
Starchy vegetables and legumes are excellent sources of:
Gut-supportive fiber
Vitamins and minerals
Complex carbohydrates that provide steady energy for the body and brain
Phytonutrients that fight inflammation
Beans, peas, lentils, and high protein grains are especially powerful because they deliver a unique combination of fiber-rich carbohydrates and protein, supporting blood sugar regulation, metabolic health, and cognitive function.
5. Healthy Fats: Quality Over Quantity
The inclusion of avocados, nuts, seeds, and olive oil is positive. Unsaturated fats from these foods support heart and brain health and help reduce inflammation.
However, placing butter and beef tallow alongside these foods—especially suggesting liberal use in cooking—conflicts with cardiovascular prevention research.
The strongest evidence supports replacing saturated fats with unsaturated fats, rather than increasing fat intake overall.
Why This Matters for Public Health
Dietary guidelines shape:
School meals
Healthcare recommendations
Food policy
How millions of people understand “healthy eating”
Patterns high in saturated fat and red or processed meat are associated with:
Cardiovascular disease
Type 2 diabetes
Certain cancers
Chronic inflammation
Gut dysbiosis
Increased dementia risk in observational studies
Public health guidance should aim to reduce chronic disease burden—not normalize foods repeatedly linked to higher risk when consumed in excess.
It’s also worth noting that some contributors involved in developing these guidelines have ties to the meat and dairy industry, raising valid concerns about conflicts of interest in public health nutrition.
Practical, Evidence-Based Guidance for Everyday Eating
Nutrition science can feel overwhelming—especially when official guidelines are confusing or conflicting. The good news? You don’t need to follow a perfect diet to support your heart, metabolism, brain, and gut. Small, consistent shifts matter.
Here’s how to apply the best-supported evidence in a practical, flexible way:
Focus on Protein Quality, Not Just Quantity
If you’re increasing protein intake, where that protein comes from matters more than hitting a number.
Prioritize plant-based protein sources most days, such as:
Beans and lentils
Chickpeas and hummus
Tofu, tempeh, edamame
Nuts and seeds (in moderate portions)
Whole grains like quinoa and farro
You don’t need to eliminate animal foods to benefit—but reducing red and processed meat and replacing it with plant protein is consistently linked with better long-term health outcomes.
Practical tip: Aim for at least one plant-protein meal a day. Think: lentil soup, bean-based chili, tofu stir-fry, or adding crunchy chickpea croutons to salads.
Choose Fats That Support Heart and Brain Health
Decades of research show better outcomes when saturated fats are replaced with unsaturated fats.
Use more often:
Avocado
Nuts and seeds
Tahini, nut butters, seed butters
Extra-virgin olive oil
Limit:
Butter
Full-fat cheese
Heavy cream
Fatty red meats
Portion matters: Most benefits from nuts show up around 1–1.5 ounces per day—a small handful, not half the plate.
Make Fruits and Vegetables the Foundation (Fresh or Frozen)
Vegetables and fruits deserve a larger role on the plate than protein or added fats.
And despite what some guidelines imply:
Frozen fruits and vegetables are nutritious
They’re often frozen soon after harvest
They’re more affordable and accessible for many households
Practical tip: Keep frozen berries, spinach, broccoli, and mixed vegetables on hand. They count and they make healthy eating easier.
Build Your Plate for Blood Sugar Balance
For metabolic health, diabetes prevention, and sustained energy, structure meals like this:
½ plate: non-starchy vegetables
¼ plate: fiber-rich carbohydrates (whole grains, starchy vegetables)
¼ plate: protein (preferably plant-based)
Add: healthy fats for flavor and satiety
This pattern supports insulin sensitivity, blood sugar balance, gut health, and fullness.
Think in Patterns, Not “Good” or “Bad” Foods
Health outcomes aren’t driven by single foods—they’re shaped by overall dietary patterns.
Patterns associated with better outcomes tend to:
Be rich in plants and fiber
Include mostly unsaturated fats
Limit red and processed meat
Minimize ultra-processed foods
Leave room for flexibility and enjoyment
You don’t need perfection. You need consistency.
Be Skeptical of “More Is Better” Messaging
When guidelines emphasize more protein, more fat, or more animal foods, it’s worth pausing.
Public health nutrition works best when it:
Reduces chronic disease risk at a population level
Prioritizes foods people can afford and access
Aligns with long-term evidence—not industry trends
If advice sounds extreme or one-sided, it probably deserves a closer look.
The Bottom Line
Whole foods matter. Fiber matters. Protein quality matters.
The most powerful dietary shifts for long-term health are additive, not restrictive:
Add more plants
Add more fiber
Add more colorful variety
This is where the strongest science and sustainable health connect.
Ready to Put This Into Practice?
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Use these sauces to elevate salads, grain bowls, roasted vegetables, wraps, and sandwiches
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These sauces are designed to make healthy eating feel abundant, flavorful, and realistic—not restrictive.
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