Sugar and Artificial Sweetness- What's the limit?
Let's Talk About Sugar (The Real Kind and the Fake Kind)
So sugar is one of those words that gets thrown around for pretty much everything, from the white stuff in your pantry to the fruit in your bowl to that pumpkin spice latte you swear is "basically just coffee." In this series, we're breaking down what sugar actually is: the four types humans eat (glucose, fructose, sucrose, and lactose), and how to decode the total, added, and free sugars on a nutrition label. We'll also look at how much added sugar is reasonable to eat in a day, which for most people lands somewhere around 25 to 30 grams, and why "no added sugar" doesn't always mean "no sugar."
From there, we'll get into what the evidence really says. Cutting sugar leads to only about two pounds of weight loss on average, but the more you're eating to start, the bigger the payoff, and sugary foods can crowd out the veggies, fruit, beans, and other whole foods your body loves. We'll also cover artificial and non-nutritive sweeteners, including which ones have raised concerns and when a swap might actually make sense. The big theme throughout is being intentional. Sugar isn't evil, and it can absolutely have a place, whether that's fuel for an ultra race or a seasonal treat. The goal is just to know what you're eating and why, so you can make choices that work for your life.
Ready to find out what's really hiding in your pantry, your coffee, and your yogurt? Keep reading to get the full breakdown, starting with what sugar actually is.
What Is Sugar, Really? A Quick Breakdown
Here's the thing: there are really just four sugars humans eat. Glucose is the big one. It's the main fuel your body runs on, and it's so essential that your body can make it on its own through a process called gluconeogenesis (even if you eat zero carbs). Fructose is the sugar found in fruit and honey, and it shows up in lots of sweeteners too. Sucrose is what most of us picture as sugar, aka the white table sugar in your pantry, and it's simply glucose and fructose bonded together. Last up is lactose, the natural sugar in milk and dairy. Everything else people call "sugar" is just these four showing up in different combinations.
Nutrition labels are a little trickier, because they don't list glucose or fructose by name. Instead, you'll see three categories. "Total sugars" counts everything: the sugars that occur naturally in a food plus anything added. "Added sugars" are the ones put in during processing, like table sugar, honey, syrups, or high-fructose corn syrup. “Free sugars” include both added sugars and sugars naturally found in foods like fruit juice and honey. This means that even 100% fruit juice, with no added sugar, counts toward your free sugar intake. That's why "no added sugar" does not mean "no sugar." Fruit juice can be loaded with free sugars without a single gram being added in.
The best way to use all this is to look at the added sugars line, especially in foods that naturally contain sugar. Take a lower-sugar yogurt that lists nine grams of total sugars and five grams of added sugars: the other four grams are just lactose from the milk, which isn't the part to worry about. Yogurt is a sneaky category, because some brands are packed with added sugar and others barely have any, so it's worth checking the label each time. Once you know the difference between total, added, and free sugars, you can read a label with confidence.
How Much Added Sugar Should You Actually Eat?
When we talk about how much sugar to eat, we're usually talking about added sugar, because that's the kind that can cause health problems and the kind we can easily overdo. The guidelines can be a little all over the place. The newer US dietary guidelines suggest keeping added sugar to no more than 10 grams per meal. The World Health Organization's older guideline says to stay under 10% of your total calories, which is about 50 grams a day on a 2,000-calorie diet (though they also note that 25 grams or less is ideal). The American Heart Association recommends 6% of daily calories or less, which works out to roughly 25 grams a day for women and 36 grams for men. Put it all together, and 25 to 30 grams of added sugar a day is a reasonable limit. In my own nutrition counseling, I aim for 25 grams a day.
To put that into real world terms, 10 grams of sugar is about two and a half teaspoons, which is the most you'd want per meal. Here's how fast it adds up: a yogurt with five grams of added sugar, served with some fruit or alongside bacon and eggs, keeps you comfortably under that limit. But if you top the yogurt with a granola that has another 10 grams of sugar, you're suddenly at 15 grams, which is over the recommendation for that meal. It's about noticing how a few "healthy-ish" add-ons can quietly push you past the line.
The tricky part is that sugar hides in places you might not expect, like pasta sauces, chips, crackers, frozen dinners, and all kinds of sauces and marinades. That's why label reading is so key. If you've never tracked your sugar before, it's a great place to start, and it can be a nice break if you're tired of counting calories or carbs.
Sugar Isn't Good or Bad, It's All About Being Intentional
I'll be the first to admit that talking about cutting back on added sugar feels a little hypocritical at times. I recently ran a 50k race, which is around 31 miles. On the day, I had a regular pumpkin spice latte (about 50 grams of added sugar - already twice what I'd recommend for a typical day), then a steady stream of gummies, gels, and pure sugars during the run, then a chocolate milkshake afterward to recover. All told, I probably ate somewhere between 400 and 500 grams of sugar in a single day. That sounds wild, but it was totally on purpose. When you're moving for that many hours, your body burns through fuel so fast that you need a quick source of glucose just to keep up. To be clear, this isn't a recommendation. If you're exercising for an hour or less, you don't need to add any extra sugar during your workout.
The bigger point is that food isn't simply "good" or "bad." It depends on how and why you're using it. Ask yourself what role a food is playing and whether there's a purpose behind it. A pumpkin spice latte every single day is probably not great for your health, but one as an occasional seasonal treat, or as a deliberate fuel source before a long run, can absolutely fit. The same logic works in reverse for foods we label "healthy." Broccoli is amazing, but if it's all you eat, you'll end up nutrient deficient and feeling pretty lousy. What we want is balance, with each food earning its place on the plate.
Sugar is the thing most likely to tip our diets out of balance, because it tastes great and it hides in so many foods. The gap between a 25 to 30 gram recommendation and the 400 to 500 grams I ate on race day shows how easily someone could land at ten times the limit or more. So here's my challenge for you: for the next few days, spot check how many grams of added sugar you're eating. No judgment, just awareness. In most cases, you'll want to land below about 30 grams a day, and once you know where you stand, the next steps get much clearer.
What the Evidence Says About Sugar (and Why Crowding It Out Works)
Does cutting sugar actually make a giant difference? The evidence says it depends on where you're starting. Higher sugar intake is linked to negative health outcomes, including cavities and poorer metabolic health, which is also why glycemic load, glycemic index, and the combination of foods you eat are worth paying attention to. But when it comes to weight, studies show that reducing sugar leads to only about two pounds of weight loss on average for adults, and increasing it leads to about two pounds of weight gain. So if you're eating a moderate amount of sugar and cut it out, you probably won't see a dramatic change on the scale.
That said, averages hide a lot. I've had patients who were drinking two liters of soda a day, stopped, and lost 25 to 30 pounds or more pretty quickly. If you're eating 300 grams of sugar a day and bring that down to 25, that's a big shift, and your body will notice. The more sugar you're starting with, the more there is to gain from cutting back. There's another reason it matters: sugary foods take up space. If you're filling up on sweet stuff, you're eating less of the foods that do your body good, like vegetables, fruit, beans, legumes, and chicken.
This is why I love a "crowd it out" approach with my patients. Instead of fixating on what you shouldn't have, whether that's sugar, fried food, or fast food, focus on what you should have. If you're eating plenty of the less healthy stuff, you're almost by definition eating less of the good stuff, so flip the script. Get your sugars mostly from fruit, beans, legumes, and nuts, and you'll find that your appetite, and honestly your stomach space, for sugary foods naturally shrinks. Most of the time, aim for whole foods and let the good stuff do the heavy lifting.
Artificial vs. Non-Nutritive Sweeteners: What to Know Before You Sip
These two terms get used interchangeably, but they're not quite the same thing. "Non-nutritive" means a sweetener contributes so little energy that it doesn't meaningfully add calories, while "artificial" means it's synthetic. Something can be non-nutritive without being artificial, like stevia or monk fruit extract, which come from plants but still fill the same role as sugar. You'll spot a whole cast of characters on labels: older ones like aspartame, saccharin, and sucralose, plant-based options like stevia and monk fruit, sugar alcohols such as erythritol, xylitol, sorbitol, and maltitol, and low-energy sugars like allulose. The FDA generally recognizes these as safe, as long as you stay under an acceptable daily intake, which varies for each one.
That said, a few of them have raised some flags. Aspartame gets the most side-eye, and while you see it less often these days, it still turns up in a lot of chewing gums and some meal replacement products. It has been classified as possibly carcinogenic, so if you can easily swap it for something else, that's probably a smart move. There are also open questions about how these sweeteners affect the gut microbiome. The research isn't fully settled, but they may not be ideal for gut health, and plenty of people notice stomach upset or diarrhea after having them, which can be a useful signal that your body isn't thrilled. Erythritol, which got really popular in the low-carb and keto world, was linked in a study a few years ago to a higher risk of cardiovascular events, so that's another one worth being aware of.
Personally, I'll admit I'm a little biased here, because I just don't enjoy the taste of most of them. I've never been a diet soda person, though I do use some meal replacements, protein bars, and shakes that contain them and have found those helpful for certain health goals. The big takeaway is that these sweeteners aren't automatically "good" just because they're low in calories, and they're not automatically "bad" either. As with sugar, check what's in your products, notice how your body responds, and choose the options that actually serve you.
The Sugar Wrap-Up: Moderation, Not Fear
To bring it all together: sugar shows up in our food in lots of different forms, both the "real" kind and the "fake" kind, and both are best enjoyed in moderation. If you haven't yet checked how much added sugar you're eating in a day, consider this your friendly nudge. Add it up and see where you land. If you're somewhere around 25 to 30 grams, great, you're on target.
If you find you're way above that, don't panic, because a few simple swaps can make a real difference. Try a plain coffee instead of a sugary one, and cut back on sweet drinks like sweet tea, energy drinks, sodas, juices, and lemonades. Take a peek at the labels on your yogurt, chips, crackers, and sauces, and look for similar options with less or no added sugar. These small changes may help a little with weight, and they'll support your overall health and inflammation levels while making more room for whole, nutrient-rich foods.
You don't need to be afraid of sugar. It can be a treat, and it can play a useful role at different times in your life. The goal is to eat more real food most of the time and let sugar be the exception
The goal isn’t perfection—it’s balance. Make real, nutrient-rich foods the foundation, and let sugar have its place without letting it take over.
For more on sugar, sweeteners, and what actually matters for your health, get the full conversation in this episode.
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