Allulose

A rare sugar (D-psicose) that tastes like sugar with ~70% of the sweetness, but contributes ~0.4 kcal/g and has minimal impact on blood sugar.

Should I eat Allulose?

Allulose is a very low‑calorie, sugar‑like sweetener that has little effect on blood sugar. For most people it is a useful sugar reducer when portioned sensibly, though large doses can upset digestion and EU authorization is pending.

Summary

Allulose is a rare sugar made by enzymatically converting fructose, then purifying the product; the enzyme is not present in the final sweetener. Human studies show minimal glycemic impact and smaller post‑meal glucose spikes when it replaces part of sucrose, supporting its use in lower‑sugar foods. The US recognizes 0.4 kcal/g for labeling and excludes allulose from Added and Total Sugars, while Australia/New Zealand approve it with intake advisories. The main practical downside is GI intolerance at higher doses. EFSA (2025) could not establish safety, so it is not authorized in the EU at this time.

Key Research Benefits

Lower post‑meal glucose and insulin

Replacing part of sucrose with allulose or taking it alongside sugar can blunt post‑meal spikes in adults, including those with type 2 diabetes.

Very low calorie sweetening

Allulose contributes about 0.4 kcal per gram—roughly one‑tenth that of sugar—helping lower calorie load while keeping sweetness and bulk.

Minimal immediate glycemic effect

Most of the allulose you ingest is excreted and does not materially raise blood glucose on its own.

Key Research Risks

Gastrointestinal intolerance at higher intakes

Above about 0.4 g/kg per serving or 0.9 g/kg per day, many people experience bloating, gas, or diarrhea.

Not authorized in the EU

EFSA could not establish safety in 2025, so D‑allulose is not currently authorized as a novel food in the EU.

Highly refined, enzymatically produced sugar

Allulose is made by converting fructose with an immobilized enzyme and then purified; the enzyme is removed and safety evaluations report no genotoxic concerns, but as a refined sweetener it adds sweetness without nutrients.

Overview

What is it?

Source: Corn or beet fructose syrups

Method: Epimerize fructose, then refine & crystallize

Processing Level: 7 / 10

Why is it used?

Purpose: Low-calorie bulk sweetener with sugar-like taste.

Commonly found in: protein bars; keto snacks; diet drinks; ice cream; sauces

Why manufacturers choose it: It delivers sugar-like taste and texture with a fraction of the calories and little glycemic impact.

Origin

Allulose (D-psicose) was identified in the 1940s in trace amounts in foods like wheat, figs and raisins. Practical production took off after Japanese researchers in the 1990s discovered enzymes (D-psicose/D-tagatose 3-epimerases) that flip the C-3 position of fructose to form allulose, enabling large-scale manufacture from fructose syrups made from corn or beet sugar. Since then, it has been studied as a low-energy ‘rare sugar’ with sugar-like functionality.

Process: Epimerize fructose, then refine & crystallize

Steps

1. Prepare feedstock: Make high-fructose syrup from corn or beet sugar.

2. Enzymatic epimerization: Apply immobilized D-psicose 3-epimerase to convert part of fructose to allulose.

3. Separate & purify: Ion-exchange, activated carbon, filtration to remove impurities/enzymes.

4. Concentrate/crystallize: Evaporate to syrup or crystallize, then dry and mill if needed.

5. Quality & packaging: Confirm low ash/metals and microbiological specs; pack as syrup or crystalline.

Chemicals

Immobilized D-psicose 3-epimerase (processing aid)

Ion-exchange resins

Activated carbon

Sodium hydroxide (resin regeneration/pH control)

Hydrochloric acid (resin regeneration/pH control)

Research & Safety

Research Summary

Allulose (D‑psicose) is a rare sugar that tastes like sugar but provides about 70% of the sweetness and roughly 0.4 kcal/g. Human studies show little to no rise in blood glucose after taking allulose alone, and smaller post‑meal glucose and insulin spikes when it replaces or accompanies sucrose, including in people with type 2 diabetes. In the US, FDA labeling guidance recognizes 0.4 kcal/g and allows excluding allulose from the Added and Total Sugars lines, reflecting its minimal metabolizable energy. Most ingested allulose is excreted unchanged. Safety reviews point to digestive tolerance as the main practical limit. Controlled studies and the Australia/New Zealand risk assessment suggest avoiding more than about 0.4 g/kg in a single serving and 0.9 g/kg per day to prevent laxative effects. The US has multiple GRAS notices with no questions for intended uses, but EFSA (2025) could not establish safety for D‑allulose as a novel food, so it is not authorized in the EU. Allulose is made by enzymatically converting fructose and then purifying; the enzyme used is a processing aid and is not present in the final product. Overall, evidence supports low calorie and glycemic advantages with portion control to avoid GI symptoms, alongside regional regulatory differences.

Digestive Effects

Allulose can draw water into the gut (an osmotic effect), which is why high doses may cause gas, cramping, or loose stools. Human data suggest most adults tolerate up to about 0.4 g/kg in a single dose and about 0.9 g/kg spread across a day. Sensitive individuals, including people with IBS and children, may experience symptoms at lower amounts, so starting low and increasing slowly is prudent. If you notice GI symptoms, reduce the serving size or space out intake over the day.

Limit Consumption

People with type 2 diabetes may see modest reductions in post‑meal glucose when using allulose in place of some sugar; monitor your readings when making changes to your diet. Children and those with IBS or sensitive digestion are more likely to experience GI symptoms at lower doses, so conservative servings are advised. There are limited data in infants; it is not specifically recommended for infant foods, and high doses should be avoided. Toxicology assessments have not identified genotoxic or reproductive/developmental concerns at intended uses, but EFSA did not establish overall safety for EU authorization, reflecting remaining uncertainties.

Fact Sheet

Regulatory Status

US FDA: GRAS—multiple GRNs with ‘no questions’; excluded from Added/Total Sugars lines; 0.4 kcal/g for labeling.

EU Status: EFSA (2025): Safety not established for novel food; not authorized in EU.

Codex INS: None assigned (no Codex GSFA entry for allulose as sweetener).

JECFA ADI: Not established for D-allulose (JECFA evaluated the epimerase enzyme, not the sugar).

ESG & Sustainability

Environmental Footprint: Feedstock from corn or beet agriculture; enzyme-catalyzed bioprocess with water/energy use and resin regeneration chemicals; overall impacts hinge on agricultural inputs and plant efficiency.

Sustainability: Plant-derived carbohydrate; potential for lower product sugar content; sustainability certifications vary by supplier.

Animal Welfare: Not applicable (plant-derived).

Carbon Footprint: Not well characterized; likely similar to refined sugars per kg product; per unit sweetness may be favorable when displacing higher-calorie sugars.

Allergens and Diet

Allergen Status: None

Diet Compatibility: Vegan, Vegetarian, Gluten-free, Dairy-free, Keto

Natural Alternatives

Honey

Source: Honeycomb nectar

Processing Level: Light

Common Uses: Tea, baking, sauces

Replacement Benefit: Minimally processed with small amounts of antioxidants and traces of minerals.

Why it's not used: Honey raises sugars/calories and changes flavor and browning; allulose gives sugar-like function with far fewer calories and negligible glycemic impact.

Date paste

Source: Whole dates

Processing Level: Light

Common Uses: Bars, cookies, smoothies

Replacement Benefit: Whole-food sweetness with fiber and potassium.

Why it's not used: Date paste adds moisture, color, and calories; less neutral taste and lower sweetness-per-gram than allulose.

Maple syrup

Source: Maple sap

Processing Level: Light

Common Uses: Glazes, yogurt, baking

Replacement Benefit: Simple processing; provides trace polyphenols.

Why it's not used: Maple syrup is high in sugars and liquid; not suitable for low-sugar calorie targets or dry formulations that need bulking like crystalline allulose.