What Are High Glucose Foods: A Complete List with Data!

Many people search for what are high glucose foods, only to find that most search results blur the line between "foods high in glucose content" and "foods with a high glycaemic index (GI)." Distinguishing these concepts is key.

The distinction is essential to answering what are foods high in glucose — the former measures free glucose present in food, while the latter measures how quickly glucose is released after digestion.

The former measures free glucose molecules naturally present in a food, while the latter measures how quickly a food releases glucose after digestion. This article lists natural and processed foods with high free glucose content using actual data.

It also contrasts them with high-GI foods that rapidly release glucose after digestion, helping you make more informed dietary choices.

Understanding Glucose in Food — Free Glucose vs Starch-Derived Glucose

Glucose in food comes from two sources: free glucose — glucose molecules naturally present in honey, fruits, and fruit juices; and starch-derived glucose — glucose released when starchy foods such as white rice, bread, and potatoes are digested.

Its starch is rapidly broken down into large amounts of glucose after digestion.

Readers often ask what foods are naturally high in glucose. The answer points to foods containing free glucose — honey, dried fruits, fresh fruits, and others.

If you are concerned about how quickly a food raises post-meal glucose levels, you also need to consider the glycaemic index.

The Harvard Nutrition Source defines GI categories as follows: "Low-glycemic foods have a rating of 55 or less, and foods rated 70-100 are considered high-glycemic foods. Medium-level foods have a glycemic index of 56-69" [1].

This means that foods with a GI of 70 or above can cause a rapid rise in glucose levels after eating.

Natural Foods High in Glucose

The natural foods below contain significant amounts of free glucose — glucose molecules already present in the food, rather than glucose released only after digestion.

1. Honey and Natural Sweeteners

Honey contains approximately 35.8 g of glucose per 100 g [2], making it one of the most common natural foods with the highest free glucose content.

By comparison, agave syrup contains only about 0.6 g per tablespoon, with its sugar being primarily fructose.

Molasses contains about 2.4 g per tablespoon. The glucose content of honey is far higher than that of agave syrup — an important distinction for anyone monitoring their glucose intake.

2. Dried Fruits

Dried apricots contain approximately 33.1 g of glucose per 100 g (per the same MyFoodData source), making them the common dried fruit with the highest free glucose content.

Other high-glucose dried fruits include: about 7.6 g in 3 prunes; about 7.2 g in 60 raisins; about 6 g in 3 dried figs (per the same MyFoodData source).

The glucose density of dried fruits is far higher than that of fresh fruits because water evaporation concentrates the sugars.

3. Fresh Fruits

Grapes contain approximately 7.2 g of glucose per 100 g (per the same MyFoodData source), making them one of the fresh fruits with the highest free glucose content.

Other fresh fruit data: about 10.1 g per cup of cherries; about 7.5 g per cup of sliced bananas; about 8.4 g per cup of sliced plums.

About 15.6 g per cup of jackfruit (per the same MyFoodData source). Although fresh fruits contain relatively high free glucose, they are also rich in dietary fibre, which can slow the rate of glucose absorption.

4. Sweet Corn and Certain Vegetables

Sweet corn contains approximately 3.4 g of glucose per 100 g (per the same MyFoodData source), making it one of the vegetables with higher free glucose content. Rutabagas (swedes) contain about 3.5 g per cup when cooked.

Overall, vegetables have lower free glucose content than fruits, but sweet corn and root vegetables remain noteworthy sources.

Processed Foods with High Glucose Content

Glucose in processed foods comes from added glucose syrup, sucrose, or concentrated fruit juice. Sugary drinks are what many readers think of first when they search what foods are high in glucose.

These products indeed contain large amounts of free glucose and added sugar.

1. Fruit Juices and Sugary Drinks

Grape juice contains approximately 6.8 g of glucose per 100 g (about 34.5 g per 16 oz glass), making it the fruit juice with the highest free glucose content.

Pomegranate juice contains about 31.6 g per 16 oz; apple juice about 13 g per 16 oz (per the same MyFoodData source).

Cola contains approximately 4.1 g of glucose per 100 g (about 20.2 g per 16 oz bottle) (per the same MyFoodData source). Fruit juices remove the dietary fibre found in whole fruits, causing glucose absorption to be far faster than with fresh fruit.

This is the key difference between juice and whole fruit.

2. Fast Foods and Sauces

Fast foods and sauces often contain added glucose syrup or sucrose. Hot cakes with syrup contain approximately 5.1 g of glucose per 100 g (per the same MyFoodData source).

BBQ sauce contains about 2.8 g per tablespoon; ketchup about 1.7 g per tablespoon.

Pasta sauce about 2.2 g per 100 g; cured ham about 4 g per 100 g. The glucose in these foods is easily overlooked — sauces and snacks with added sugar are hidden sources of daily glucose intake.

3. Baked Goods and Sweets

Apple pie contains approximately 4.9 g of glucose per 100 g (per the same MyFoodData source). A bagel contains about 2.3 g; chocolate cake with frosting about 2 g.

Sweets and glucose tablets contain about 40–60 g of glucose per 100 g — the highest free glucose content among all food categories.

Baked goods contain both high free glucose and high starch-derived glucose, making their dual impact on post-meal glucose levels worth noting.

High-GI Foods That Spike Glucose After Digestion

Some readers searching what foods are high glucose are actually looking for high-GI foods — these foods contain almost no free glucose, but their starch is rapidly converted to glucose during digestion, causing glucose levels to rise quickly.

Per the Harvard Nutrition Source definition cited earlier, foods with a GI of 70 or above are classified as high-GI.

1. White Rice and Refined Grains

White rice has a GI of approximately 73 (per international GI tables), classifying it as a high-GI food. White bread and cornflakes have even higher GI values.

Compared with whole grains (brown rice GI approximately 50–68, wholemeal bread GI approximately 50–60), refined grains have starch structures that are more easily broken down by digestive enzymes, releasing glucose significantly faster.

2. Potatoes and Starchy Tubers

Baked potatoes have a GI of approximately 85–90 (per international GI tables), making them one of the highest-GI staple foods.

Sweet potatoes have a moderate GI (approximately 44–60) due to their higher dietary fibre and more complex carbohydrate structure.

The starch in potatoes is almost entirely the easily digestible type — this means that even though their free glucose content is close to 0 g, the glucose released after digestion can still cause significant post-meal glucose fluctuations.

3. Instant Oatmeal and Processed Breakfast Cereals

Instant oatmeal has a GI of approximately 75–83 (per international GI tables), far higher than steel-cut oats with a GI of approximately 42–55. Processing destroys the physical structure of oats, making the starch more digestible.

Commercial breakfast cereals such as Raisin Bran contain about 6 g of free glucose per cup (per MyFoodData source) alongside high GI values.

Choosing steel-cut or traditional oats over instant oatmeal can significantly slow the rate of glucose release.

What Foods Are Good for High Glucose Levels? — Swaps and Strategies

Answering what foods are good for high glucose levels requires considering two aspects: short-term management (what to eat when glucose is currently elevated) and long-term strategy (how to reduce glucose fluctuations through daily diet).

When glucose is elevated, avoid consuming additional high-glucose or high-GI foods. Recommended choices include: non-starchy vegetables (broccoli, peppers, leafy greens), protein (eggs, fish, lean meat), and water or sugar-free tea.

Readers looking for healthy glucose foods will find that "healthy" high-glucose foods such as fresh fruits and honey can be consumed in moderation — the key is portion control and pairing with dietary fibre.

Long-term strategies include: low-GI swaps (white rice → brown rice or quinoa; sugary drinks → water or sugar-free tea); pairing protein with carbohydrates to slow glucose release; and dietary fibre to delay glucose absorption.

Mass General Brigham suggests that combining protein with carbohydrates can slow the flow of glucose. For more glucose management tools, visit SIBIONICS CGM.

Tracking Glucose After Eating — How CGM Helps

Continuous glucose monitoring (CGM) is a practical tool for tracking post-meal glucose changes. CGM sensors are inserted under the skin and measure glucose concentration in interstitial fluid.

Readings are converted into estimated blood glucose values through an algorithm. As one PMC review notes, "CGM systems measure glucose in interstitial fluid but not in blood" [3].

"Rapid changes in one compartment are not accompanied by similar changes in the other, but follow with some delay" — the overall mean time delay was 9.5 minutes (SD 3.7 min) in the same source.

This delay is important to understand when first learning about CGM.

Leading CGM devices include Abbott FreeStyle Libre, Dexcom, and SIBIONICS GS3.

SIBIONICS GS3 is a CE-certified CGM available in the European market.

The GS3 sensor can be worn for up to 14 days per session, requires no fingerstick calibration, and updates glucose readings every 5 minutes (per SIBIONICS GS3 official documentation).

To explore more CGM device options, visit SIBIONICS glucose monitor.

The value of CGM lies in helping you identify your individual response to different high-glucose foods — the same food may affect glucose levels very differently from one person to another.

Comparison — Free Glucose vs High-GI Foods at a Glance

The comparison table below helps you quickly distinguish between the two categories of high-glucose sources:

Food	Free Glucose (g/100 g)	GI Value	Main Glucose Source
Honey	~35.8 [2]	~58	Free glucose
Dried Apricots	~33.1 (per same source)	~32	Free glucose
Grapes	~7.2 (per same source)	~43	Free glucose
Cola	~4.1 (per same source)	~63	Free + added glucose
White Rice	~0	~73	Starch-derived
Baked Potato	~0	~85–90	Starch-derived
Instant Oatmeal	~0	~75–83	Starch-derived

Honey and dried apricots have the highest free glucose content, but their GI values are not the highest — because they do not contain large amounts of easily digestible starch.

White rice and baked potatoes contain almost 0 g of free glucose but have high GI values — their starch rapidly releases glucose after digestion.

The two categories affect glucose levels through entirely different mechanisms. For more on how continuous glucose monitoring can help track post-meal glucose changes, visit the SIBIONICS website.

Verdict

Understanding "high glucose foods" requires distinguishing between free glucose content and GI value. Natural high-glucose foods (honey, dried fruits, fresh fruits) contain large amounts of free glucose but can be consumed in moderation.

Processed high-glucose foods (sugary drinks, sauces, baked goods) should be limited. High-GI foods can rapidly raise glucose levels even when their free glucose content is low — white rice, potatoes, and instant oatmeal all fall into this category.

Next step: use a continuous glucose monitor to track your individual glucose response data to different foods, and discuss a personalised dietary plan with your doctor.

cgm devices can help you build a personalised connection between food and glucose.

FAQ

Q: What food is highest in glucose?

Pure dextrose powder contains nearly 100 g of glucose per 100 g, making it the substance with the highest glucose content.

Among common foods, honey contains approximately 35.8 g per 100 g of free glucose (per MyFoodData data cited earlier), and dried apricots about 33.1 g per 100 g (per the same source).

The common foods with the highest free glucose content are honey and dried fruits — this data directly answers the core question behind what food are high in glucose.

Q: What foods are naturally high in glucose?

Natural foods high in free glucose include: honey, dried fruits (dried apricots, prunes, raisins), fresh fruits (grapes, cherries, jackfruit), and sweet corn. The glucose in these foods occurs naturally, not as added sugar.

Q: Are high glucose foods the same as high GI foods?

No. High glucose foods and high GI foods are two different concepts. Honey contains approximately 35.8 g of free glucose per 100 g (per MyFoodData data cited earlier) but has a moderate GI of about 58.

White rice contains almost 0 g of free glucose but has a high GI of about 73 (per Harvard GI definition cited earlier). The former measures the quantity of glucose molecules, while the latter measures the speed of glucose release after digestion.

Q: What can I eat when my glucose levels are high?

When people search what foods are high in glucose levels, they usually want to know how to manage currently elevated glucose.

Short-term advice: avoid consuming additional high-glucose or high-GI foods, and choose non-starchy vegetables and protein.

The NHS states that an HbA1c "48 mmol/mol or over" or a fasting glucose "Over 7 mmol/L" indicates elevated glucose [4][5] — if levels remain persistently high, consult your doctor.

Q: What foods are bad for high glucose?

Sugary drinks (cola ~4.1 g glucose per 100 g, per MyFoodData data cited earlier), refined grains (white rice GI ~73), potatoes (baked potato GI ~85–90), processed sauces, and baked goods.

These foods either contain large amounts of free or added glucose, or they rapidly release glucose after digestion. Both effects can worsen elevated glucose levels.

Q: How can I track how different foods affect my glucose?

CGM devices such as Abbott FreeStyle Libre, Dexcom, and SIBIONICS GS3 can continuously track interstitial fluid glucose changes, helping you observe the actual impact of specific foods on your individual glucose levels.

Specifications vary by brand — please refer to each device's official user guide for wear duration, water resistance ratings, and applicable populations.

References

[1] Harvard T.H. Chan School of Public Health. (2024). Carbohydrates and Blood Sugar. The Nutrition Source. https://nutritionsource.hsph.harvard.edu/carbohydrates/carbohydrates-and-blood-sugar/
[2] Whitbread, D. (2024). Top 10 Foods Highest in Glucose. MyFoodData. https://www.myfooddata.com/articles/high-glucose-foods.php
[3] Schmelzeisen-Redeker, G., et al. (2015). Time Delay of CGM Sensors: Causes and Countermeasures. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC4667340/
[4] NHS. (2024). High blood sugar (hyperglycaemia) — HbA1c thresholds. https://www.nhs.uk/conditions/high-blood-sugar-hyperglycaemia/
[5] NHS. (2024). High blood sugar (hyperglycaemia) — Fasting glucose thresholds. https://www.nhs.uk/conditions/high-blood-sugar-hyperglycaemia/

Disclaimer

This article is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

Author Information

This article was written by the SIBIONICS Professional Health Content Team. The author has years of research experience in CGM and diabetes management, helping users optimise their device experience through science-based practices.

Last Updated: May 27, 2026

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