Nutrition Basics- Part 10: Sugar and High Fructose Corn Syrup

Why It Matters, Where It Hides, and How to Keep It in Its Place

By Larry Betz | Prepared Not Paranoid https://www.preparednotparanoid.com/


Sugar is the easiest thing in the store to find and one of the hardest things to avoid. It's in bread, pasta sauce, salad dressing, "healthy" granola, flavored yogurt, and almost every drink in the cooler.

Most families aren't eating too much sugar because they sit down with a bag of candy. They're eating it because it's hidden in foods they never think of as sweet. According to the CDC, Americans take in about 17 teaspoons of added sugar a day, and the biggest sources are sweetened drinks, desserts, and sweet snacks.

This post gives you the facts on sugar and high fructose corn syrup so you can make calm, informed choices for your family, every day and when the pantry is all you have.

Added Sugar vs. Natural Sugar

There's a difference between the sugar in an apple and the sugar poured into a soda.

Natural sugars come packaged with fiber, water, vitamins, and minerals, as in whole fruit and plain milk. The fiber slows absorption and fills you up. It's hard to overeat apples.

Added sugars are sugars and syrups put into food during processing or preparation, or added at the table. That includes table sugar, high fructose corn syrup, honey, maple syrup, agave, and fruit juice concentrates. Yes, honey and maple syrup count. They're less processed, but your body still treats them as added sugar.

How Much Is Too Much? (Checked October 2026)

The Dietary Guidelines for Americans, 2025 to 2030, released January 7, 2026, are the strictest yet on added sugar:

  • Children younger than 11: no added sugar.

  • Teens and adults: no more than 10 grams of added sugar per meal. That's about 2.5 teaspoons.

  • Everyone: no amount of added sugar is recommended as part of a healthy diet.

You'll still see the older limit (less than 10 percent of daily calories, about 50 grams a day) on food labels and many websites. It's a reasonable outer limit, but the new per-meal guidance is the target.

What Is High Fructose Corn Syrup?

When reading food labels, it's crucial to look beyond calories and macronutrients (protein, carbohydrates, and fats) and examine the ingredients list. Ingredients provide a clearer picture of what is in the food. Commonly found sugars include fructose, high fructose corn syrup (HFCS), corn syrup, and corn syrup solids. Fructose is an isomer of glucose, meaning it has the same molecular formula as glucose but a different structure.

Table sugar (sucrose) is one glucose molecule bonded to one fructose molecule, so it's 50 percent fructose. High fructose corn syrup starts as corn syrup, which is almost all glucose. Enzymes then convert part of that glucose into fructose. The two common types are HFCS 42 (about 42 percent fructose), used in processed foods, baked goods, cereals, and condiments, and HFCS 55 (about 55 percent fructose), used in most regular sodas and sweetened drinks.

Why Is Fructose Used in Foods?

Fructose is used commercially in food and beverages primarily because of its high relative sweetness and low cost. It is the sweetest naturally occurring carbohydrate (perceived to be 1.73 times as sweet as sucrose). The sweetness of fructose is detected earlier and peaks higher than that of sucrose or dextrose, but it diminishes more quickly.

Natural Sources of Fructose

Fructose naturally occurs in fruits, vegetables, and honey. It can exist as a free monosaccharide (simple sugar) or be bound to glucose as a disaccharide. Foods containing free fructose typically have an approximate 1:1 ratio of fructose to glucose. Some fruits, like apples and pears, have higher proportions of fructose to glucose, while others, like apricots, have lower proportions.

That's not a reason to fear fruit. Whole fruit brings fiber, water, and bulk that slow everything down.

The Problem with Fructose

Fructose has received criticism due to how the body processes it which is different from other sugars. Unlike glucose and dextrose, which are readily converted to muscle glycogen (a form of stored carbohydrate in muscles), fructose must be processed in the liver before conversion to glycogen. If liver glycogen stores are full, fructose is converted to fat and stored, potentially raising triglyceride levels.

How much fructose your gut can absorb comfortably varies widely from person to person, from about 5 grams to 50 grams at a time. Above that, many people get bloating, gas, or loose stools.

The Soda Example, Corrected

You may have seen the claim that a can of soda has 40 grams of fructose. That overstates it.

Here is the real math for a 12-ounce can of regular cola sweetened with HFCS 55.

About 22 grams of fructose, delivered in liquid form in a few minutes, with no fiber and no protein, is a lot for the liver to handle at once, and many people drink more than one can a day. The bigger problem isn't one can. It's the daily habit.

HFCS or Cane Sugar: Which Is Worse?

A 2021 UC Davis study in the Journal of Clinical Endocrinology and Metabolism found that drinks sweetened with HFCS and drinks sweetened with table sugar both increased liver fat and reduced insulin sensitivity, with no meaningful difference between them. HFCS 55 has slightly more fructose than table sugar, but the difference is small. A "made with real cane sugar" soda is still a soda. Cut the total, not just the type.

Health Risks of Fructose and High-Fructose Corn Syrup

All fructose is metabolized in the liver, which prioritizes its processing over other functions. Consuming whole fruits like oranges provides bulk, promotes satiety, and contains fiber, making them a healthier option than fruit juices or sugary beverages.

High-fructose corn syrup (HFCS) is made from corn syrup and is sweeter than regular corn syrup. It's commonly found in processed foods and sodas. Studies have shown that HFCS can have adverse health effects, including increasing the risk of heart disease, diabetes, and other metabolic disorders.

The 10-week study. In a controlled trial at UC Davis, overweight adults drank either fructose-sweetened or glucose-sweetened drinks making up 25 percent of their calories for 10 weeks. Both groups gained similar weight. But the fructose group added more fat deep in the belly, around the organs, made more new fat in the liver, had worse cholesterol and triglyceride levels, and became less sensitive to insulin. The glucose group did not show those changes.

The beverage evidence. A 2015 review in the Journal of the American College of Cardiology concluded that sugar-sweetened drinks, a major source of fructose in the American diet, are linked to weight gain, type 2 diabetes, and heart disease.

Key Facts About Fructose and Corn Syrup Products

  • Corn syrup is mostly glucose. It's less sweet than table sugar.

  • Corn syrup solids, also known as corn syrup powder, are corn syrup with most of the water removed. They show up in coffee creamers, powdered drink mixes, and some infant formulas.

  • Dextrose is glucose made from corn. It's approximately ¾ as sweet as sucrose.

  • HFCS undergoes further processing to adjust the percentage of fructose.

  • Crystalline fructose is nearly pure fructose and is used in some "light" or "diet" products. It's handled by the liver the same way as any other fructose.

  • Genetically modified corn. More than 90 percent of the corn grown in the U.S. is genetically engineered, according to the USDA, so nearly all corn syrup comes from GE corn. If you prefer to avoid GE ingredients, look for USDA Organic or Non-GMO Project Verified products.

What About Mercury in HFCS?

This one gets passed around a lot online, so here are the real facts. In 2009, Dr. Renee Dufault and colleagues tested 20 samples of commercial HFCS collected in 2005 and found detectable mercury in 9 of them. The likely source was a type of chemical plant (mercury-cell chlor-alkali plants) that made processing chemicals used by some corn refiners at the time. A companion test by the Institute for Agriculture and Trade Policy found detectable mercury in about one-third of 55 brand-name foods with HFCS listed first or second.

The Corn Refiners Association responded that the industry had already moved to mercury-free processing chemicals, and those plants have been closing across the U.S. I haven't found newer independent testing that confirms or refutes that. The honest answer: the risk today is likely lower than in 2005, but it was never a good reason to keep HFCS in your diet anyway.

Arsenic in Brown Rice Syrup

Brown rice syrup is often sold as the "healthy" alternative to corn syrup, and it shows up in organic snack bars, toddler foods, and energy products. In 2012, Dartmouth researchers found that toddler formulas using organic brown rice syrup as the main ingredient had total arsenic up to six times the EPA's safe drinking water limit. Rice absorbs arsenic from soil and water more than most crops, and the syrup concentrates it.

Organic doesn't protect you here, because the arsenic comes from the soil and water, not from pesticides. Read the labels on toddler foods and snack bars, and vary your kids' grains (oats, barley, quinoa) instead of relying on rice.

Agave, Honey, and Other "Natural" Sweeteners

Agave nectar is marketed as natural and "low glycemic," but it's typically much higher in fructose than table sugar or even HFCS. The low glycemic number comes from the fructose, not from any health benefit.

Honey, pure maple syrup, and coconut sugar are less processed and carry small amounts of minerals and antioxidants, which is why I prefer them for home use.

They still count as added sugar.

Never give honey to a baby under 1 year old because of the risk of infant botulism.

What about artificial sweeteners? Swapping sugar for a sweetener isn't a free pass. In 2023, the World Health Organization recommended against using non-sugar sweeteners for weight control, and the new Dietary Guidelines advise limiting them. I cover saccharin, aspartame, sucralose, Ace-K, and stevia in Toxic Chemicals to Avoid, Part 2 (linked below). If you're using a sweetener to get off regular soda, that's a step in the right direction. Treat it as a bridge, not the destination.

Sugar in Your Emergency Plan

Here's where I part ways with people who treat sugar as pure evil.

In an emergency, sugar has a job.

If anyone in your family has diabetes and uses insulin or certain oral medications, glucose tablets or gel are not optional. Keep them in the go-bag and the car kit, and check the expiration dates when you rotate your supplies.

Sugar is a tool, not a food group. Build your emergency pantry around protein, beans, whole grains, and vegetables, and store a modest, intentional supply of sweet items for medical needs and morale. And keep your rotation going: new food goes to the back, older food moves to the front, and you eat from the front.

Start Here This Week

Step 1: Check the "Added Sugars" line on five foods your family eats every day. Circle anything over 10 grams per serving.

Step 2: Look for high fructose corn syrup, agave, and brown rice syrup on your pantry labels.

Step 3: Replace one sweetened drink per day with water, sparkling water, or unsweetened tea.

Step 4: Cut the sugar in your coffee, tea, or oatmeal by a quarter each week. Most people stop noticing after a month. Kids adjust even faster than adults.

Step 5: If anyone in your family has diabetes, add glucose tablets to your go-bag and car kit.

Ask Yourself

  • Where is most of the added sugar in my house actually coming from?

  • Am I using sweeteners as a bridge off sugar, or as a permanent habit?

  • Does my emergency pantry have the right kind of sugar for the right job?

Remember

Understanding the impact of high-fructose corn syrup and other forms of fructose on your health is crucial. Limiting consumption of these sugars and opting for whole foods with natural sugars and fiber can help mitigate health risks and promote better overall well-being. Cut the hidden sugar first, and keep a small, smart supply on hand for when your family needs it most.

Get Started Today

[FREE DOWNLOAD: TO BE CHOSEN AFTER THE BINDER REVIEW]

Go Deeper

The Prepared Not Paranoid Family Nutrition Guide. This post shows you where the sugar is hiding. The guide's full chapter on sugar and sweeteners gives you the complete sweetener safety table (aspartame, sucralose, erythritol, allulose, monk fruit, and more, with where each one stands as of October 2026), the "Retrain Your Sweet Tooth" plan, a One-Page Food Label Cheat Sheet for the store, and a whole-food emergency pantry plan your family will actually eat. [Get it here: LINK]

Tools I recommend: The food storage containers and kitchen tools I recommend are in my Amazon store. https://amzn.to/4yM747h

Related reading:

References

Disclaimer

This article is for general informational and educational purposes only. It is not medical advice and is not a substitute for guidance from your physician or a registered dietitian. If you have diabetes, prediabetes, fatty liver disease, or are pregnant, talk with your doctor about sugar and sweetener choices. Changing your diet can change how some diabetes medications work, so don't adjust medications on your own. Affiliate disclosure: I've linked to products from my Amazon store that I personally recommend. As an Amazon Associate, I earn from qualifying purchases, at no extra cost to you. Thank you for supporting my work.

In a medical emergency, call 911.

Awareness gives you time. Time gives you options.

The prepared protector is someone who's decided that loving someone means being ready for them, not just hoping things go fine.

Prepared Not Paranoid. Protecting the Most Vulnerable Among Us.

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Nutrition Basics- Part 11: Caffeine and Energy Drinks