When I first became interested in nutrition, Google was my best friend.
If a topic caught my attention, I’d start searching. I’d read articles, watch videos, listen to podcasts, and often rely on other people to interpret the research for me. Credentials carried a lot of weight. A physician sounded more convincing than a blogger. A bestselling author sounded more convincing than an unknown researcher. New discoveries and cutting-edge ideas were especially exciting.
Like many people, I was drawn to explanations that seemed to make sense.
Looking back, I don’t think I was careless.
I think I was doing what most curious people do.
I was trying to find the truth.
The problem was I underestimated how hard that can be.
The more nutrition I studied, the more I noticed a pattern. Two intelligent people could look at the same body of evidence and reach different conclusions. Experts disagreed. Headlines exaggerated findings. Animal studies got reported as if they applied directly to humans. A plausible mechanism was often treated as proof. Research that looked convincing at first glance often fell apart when I dug into the details.
At first, this was frustrating.
I wanted answers.
What eventually changed wasn’t my desire to find them. If anything, that desire got stronger. What changed was how much I now appreciate the evidence a claim needs before I’ll trust it.
Today, when a nutrition claim catches my attention, I keep coming back to the same questions.
Not because they guarantee the right answer.
They don’t.
But they help me tell what’s merely plausible from what’s genuinely persuasive.
What is the claim?
Before I evaluate a claim, I want to know exactly what’s being claimed.
Sounds obvious, but many nutrition discussions never get past the headline.
“Seed oils are toxic.”
“Carbohydrates cause diabetes.”
“This supplement boosts immunity.”
The moment you start asking follow-up questions, the certainty often starts to fade. What population? What outcome? Compared to what? Under what circumstances?
Many claims become much less persuasive once you state them precisely.
What evidence supports it?
Not all evidence deserves the same confidence.
A personal story can be valuable.
A mechanistic explanation can be interesting.
An animal study can generate a hypothesis.
But those forms of evidence answer different questions than controlled human trials, systematic reviews, and meta-analyses.1
One of the biggest changes in my thinking has been learning to distinguish between evidence that’s intriguing and evidence that’s persuasive.
What does the totality of evidence suggest?
One study rarely changes my mind anymore.
I want to know if a finding has been replicated. Have different researchers reached similar conclusions? Have similar results shown up across different populations? Does the broader body of evidence generally point in the same direction?
Almost any position can find a study that appears supportive.
What matters more is whether the finding survives repeated attempts to test it.
This is one reason I changed my mind about seed oils. Years ago, I was much more sympathetic to the idea that they should be avoided whenever possible. The arguments sounded compelling, and some of the mechanisms seemed plausible. The more I learned about polyunsaturated fats and the broader body of evidence, the less confident I became in that position.2 I didn’t abandon the question. I just became less convinced by the certainty.
How was the study conducted?
This is where details matter.
How many participants were included?
How long did the intervention last?
What was the comparison group?
Was there a placebo?
Were participants blinded?
How was adherence measured?
How many people dropped out?
A strong conclusion drawn from a weak study shouldn’t get the same confidence as the same conclusion backed by rigorous research.
Who was studied?
One of the most important questions in nutrition is also one of the most overlooked:
Who does this actually apply to?
A finding in healthy young adults might not apply to older adults.
A result seen in athletes might not apply to sedentary people.
Research in one population might not fully translate to another.
This is one reason I’ve become more interested in studies that focus on specific populations instead of assuming everyone responds the same way. Context matters.
Does the mechanism match the outcome?
Nutrition is filled with compelling biological explanations.
Sometimes they turn out to be correct.
Sometimes they don’t.
A mechanism can sound logical, appear scientifically grounded, and still fail to produce meaningful results in real people when tested.
I’ve learned to appreciate biological plausibility while remembering that what actually happens to people matters more than elegant theories.
What do thoughtful critics say?
Whenever I find myself strongly agreeing with a claim, I look for thoughtful people who disagree with it.
Not because I want to dismiss the idea.
Because I want to stress-test it.
Weak ideas often collapse when challenged.
Strong ideas usually become stronger.
The internet makes it remarkably easy to surround yourself with people who already agree with you. I’ve done it before. Most of us have. Seeking out disagreement is one of the best ways I know to avoid confusing consensus within a community with consensus within the evidence.
What incentives exist?
I pay attention to incentives.
Books.
Supplements.
Courses.
Product partnerships.
Affiliate relationships.
Attention itself.
An incentive doesn’t automatically invalidate a claim.
But it reminds me to look carefully.
People can be sincere and still be wrong. They can also be knowledgeable and still have incentives that shape how they talk about uncertainty.
What would change my mind?
This is one of the hardest questions I ask myself.
Before deciding where I stand, I try to identify what evidence would convince me that I’m wrong.
If no evidence could change my position, then I’m no longer evaluating information objectively.
I’m defending a belief.
This question has become more important to me over time because changing your mind isn’t a sign of weakness. In science, it’s often a sign that the process is working.
How confident should I be?
This is often where I end up.
Not with certainty.
Not with complete skepticism.
But with confidence that matches the quality of the evidence.
Some questions deserve high confidence.
Others deserve cautious optimism.
Many deserve humility.
Learning the difference is one of the most valuable lessons nutrition has taught me.
The goal
I still care deeply about finding the right answers.
I care about the science.
I care about understanding what actually improves health and what doesn’t.
What’s changed is how much I appreciate how hard that work can be.
The more I study nutrition, the less I care about strong claims and the more I care about strong evidence.
Nutrition education didn’t make me cynical.
It made me more demanding.
My goal isn’t to become impossible to persuade.
My goal is to make sure that when I change my mind, it’s because the evidence earned it.
The strongest opinions I hold today aren’t the ones I’m most attached to. They’re the ones that have survived the most scrutiny.
Finding the truth is still the goal.
I’ve simply learned that getting there requires a better process than I once thought.
And if nutrition has taught me anything, it’s that good questions are often more valuable than quick answers.