Sugar isn't just sugar. Here's the number I now watch.

I want to talk to you about a word I trusted for too long. Natural.

For years I told myself that as long as sugar came from something natural, from fruit, from honey, from agave, it was fine. It was healthy, even. It was the opposite of the white stuff in the little packets. That's the story I had built in my head, and it's the story marketing had helped me build.

Then I started reading. And what I learned made me look at every bottle of juice, every smoothie, every handful of dried fruit, differently. Because it turns out that "natural" and "harmless" are not the same word. They have never been the same word.

The number that stopped me.

There's a review paper published in June of 2025, in the journal Molecular Biomedicine, written by a team of researchers from West China Hospital and Sichuan University. They pulled together what the current science says about fructose, the sugar that makes fruit taste sweet, and what happens in the body when you eat too much of it.

Their conclusion, in their own careful language, was that fructose is a naturally occurring sugar that can be safely metabolized in small to moderate amounts, which they defined as less than 30 grams per day. Above that, chronic intake starts to overwhelm the body's metabolic system. And above 50 grams per day, they wrote, there are significant metabolic consequences.

Let me put those numbers in something I can picture.

Thirty grams of fructose is roughly what you'd get from three medium apples. Or from about one and a half cups of orange juice. Or from a single large sports drink. Or from a couple of tablespoons of honey in your tea. The number sounds generous until you see how quickly a normal day of "healthy" choices adds up to it.

Fifty grams, the danger zone, is not hard to hit either. One smoothie with fruit and honey, a handful of dried fruit as a snack, and a soda with dinner, and you're already there. Without eating a single thing you would have called "junk food."

That's what stopped me. Not the number itself. The distance between the number and what I had been calling healthy.

Why fructose is different.

Here's the part the label never explains.

Glucose, the other main sugar, can be used for energy by almost every cell in your body. When you eat it, your muscles, your brain, your heart, all of them can take a share. The load gets distributed.

Fructose doesn't work that way. Almost all of the fructose you eat goes straight to your liver. Your liver is the only organ that processes it in any real quantity. And once the liver has used what it needs, everything left over gets turned into fat. Not fat in the friendly sense of energy storage. Fat in the sense that builds up inside the liver itself and starts causing problems.

That's why fructose is linked in the research to a condition doctors used to call fatty liver disease, and now call metabolic dysfunction-associated steatotic liver disease. It's why fructose is linked to high triglycerides, which was the number that scared me most in my own bloodwork years ago. It's why the same amount of calories from fructose does more damage than the same amount from glucose.

I'm not a scientist and I'm not going to pretend the debate is finished, because it isn't. But the direction of the evidence is clear enough that I started paying attention.

Not all fructose behaves the same way.

Here's where it gets interesting, and where the answer isn't "never eat fruit."

The same 10 grams of fructose in a whole apple and in a glass of apple juice do not hit your body the same way. The apple comes with fiber. Fiber slows everything down. The sugar in the apple releases into your bloodstream gradually, over the time it takes to chew, digest, and absorb an actual piece of fruit. The liver gets the sugar in a trickle it can handle.

The juice has had the fiber taken out. The same 10 grams of fructose now hit your system in a rush. The liver gets slammed instead of drip-fed. And your body's response is completely different.

This is why I stopped drinking juice years ago, and why I look at smoothies with a lot more skepticism than most people. A smoothie sounds like a health food. If it has three servings of fruit blended down into a drink you can finish in five minutes, it's really a sugar delivery system with vitamins on the side.

Same molecule. Different context. Completely different effect. That's the part that took me the longest to understand.

Where I look now.

The worst sources of concentrated fructose, based on what the research consistently shows, are the ones marketing pushes hardest as healthy alternatives. High fructose corn syrup, obviously, which is in almost every processed food and drink. Fruit juices, including the ones labeled 100% juice with no added sugar. Dried fruit, where the sugar is concentrated by the removal of water. Honey and agave and maple syrup, which get treated as "natural" replacements for sugar and are chemically almost identical to it. Regular table sugar, which is half fructose by weight.

And then, of course, the whole aisle of soft drinks, sports drinks, and flavored waters where fructose is the entire product.

When I stopped eating that way, my triglycerides came down. I've told you that story before, so I'll leave it there.

What I do about it.

I still eat fruit. I eat berries most days, whole apples sometimes, whatever is in season, in normal amounts. Whole fruit is not the enemy. Overdose is the enemy.

What I don't do anymore is drink my fruit. I don't buy dried fruit as a snack. I don't put honey in my coffee. I don't fall for the label that says "no added sugar" when the whole product is a concentrated source of natural sugar. Because "no added sugar" and "no sugar" are, again, not the same words.

And when I built the nut butters at Fatly Good, the peanut butter and the almond butter, I did the same thing I did with the ghee and the tallow. One ingredient. Zero added sugar. Nothing to hide.

If you check almost any nut butter in a normal supermarket, you'll find sugar in the ingredient list. Sometimes as sugar. Sometimes as cane juice. Sometimes as honey or molasses or evaporated fruit juice, dressed up to sound wholesome. It's there because it makes the product taste more addictive. It's there because it's cheap. And it's there because most shoppers won't flip the jar over and read.

I built ours the other way on purpose. Because if I'm going to tell you that thirty grams of fructose is a real number worth watching, the least I can do is make sure my own products aren't part of the problem.

Fat never felt so right.

Gustavo Rodriguez, Founder