Overlapping Nutrition Facts labels in several colors covering calories, fats, carbohydrates and protein

How to Read Food Labels With Diabetes: A US and UK Guide

Key Takeaways

  • The ADA names serving size and grams of total carbohydrate as the two label items to check.[1]
  • Total carbohydrate already includes sugar, starch and fibre, so you don't add added sugars on top.[1]
  • "Net carbs" has no FDA-approved definition, and the ADA recommends using total carbohydrates.[2]
  • "Sugar free" means under 0.5 g (0.02 oz) of sugars per serving in the US. It does not mean carb free.[3]
  • UK labels list values per 100 g (3.5 oz) and often use traffic light colours. Check the portion size too.[4]

Reading food labels for diabetics looks simple until you try it in a busy aisle. A label gives you a number to count. Counting by eye is where people slip. In one study of 50 adults with type 1 diabetes, 63% of 448 meals had their carbohydrate underestimated by the person eating them.[5] That was their own everyday estimate, recorded in a food diary. It was type 1 only.

This guide shows how to read nutrition labels for diabetes in the US and UK. It explains why "net carbs" is not an official term and what "sugar free" really means. It also settles the net carbs vs total carbs diabetes question. This guide is general education. If you use insulin or other glucose medicines, follow the plan your diabetes team gave you.

How to read food labels for diabetics: where do you start?

Start with two lines: serving size and total carbohydrate. The American Diabetes Association (ADA) names these as the two label items to check.[1] The carbohydrate figure "includes all carbs: sugar, starch and fiber." You don't need to add the added sugars line on top of it.[1] That is how to read food labels for diabetics in two steps: check the serving size first, then the total carbohydrate for the portion you will eat.[1] US labels give values per serving and UK labels give them per 100 g (3.5 oz), so work out your own portion.[6][4]

The FDA adds a warning about the serving size. It tells shoppers to check how many servings are in the package. It also says the serving size "is not a recommendation of how much you should eat or drink."[6]

The ADA also says there is "no magic number" for carbohydrate, and counts one carb choice as about 15 g (0.5 oz).[1] A dietitian or your diabetes team can set your own target.

Diabetes label reading comes down to the same two lines every time: serving size and total carbohydrate.[1] Take an invented US label that shows 30 g (about 1 oz) of total carbohydrate per serving. The ADA counts one carb choice as about 15 g (0.5 oz), so that serving is two carb choices.[1] Eat two servings and you have eaten 60 g (about 2 oz) of carbohydrate.

Reading food labels for diabetics: how do US and UK labels compare?

How you read the label depends partly on where you shop, because the two systems show the same nutrients in different ways. US labels give values per serving, with a percent Daily Value (%DV) where 5% or less is low and 20% or more is high.[6] UK labels give values per 100 g (3.5 oz) and use red, amber and green colours.[4] The table puts them side by side.

Feature. US Nutrition Facts label. UK label.
Basis for the numbers.[6][4] Per serving. Check the number of servings in the package.[6] Per 100 g (3.5 oz). The maker's idea of a portion may differ from yours.[4]
Carbohydrate to count.[1][7] Total Carbohydrate, which includes sugar, starch and dietary fibre.[1] Carbohydrate (total). On UK and EU labels, fibre is listed on a separate line and is NOT included in the carbohydrate figure. Diabetes UK says count the total carbohydrate, not the "of which sugars" value.[7][8]
Sugars.[6][4] Total Sugars includes natural and added sugars. Added Sugars has its own line.[6] "Of which sugars." For food, low is 5 g (0.18 oz) or less per 100 g (3.5 oz) and high is more than 22.5 g (0.79 oz) per 100 g (for drinks, low is 2.5 g (0.09 oz) or less per 100 mL (3.4 fl oz) and high is more than 11.25 g (0.40 oz) per 100 mL (3.4 fl oz)).[4][9]
Quick rating.[6][4] %DV: 5% or less is low, 20% or more is high.[6] Red is high, amber medium, green low.[4] The scheme is voluntary.[9]

Do colours help? A review of 156 studies found that traffic light labels raised the odds of choosing more healthful products (odds ratio 1.5).[10] Those were general shoppers, not people with diabetes. A green light for sugars also says nothing about the carbohydrate total. That total is the number you count.

Total carbs or net carbs: which number matters?

Use total carbohydrate. The ADA Diabetes Food Hub states that "there is no FDA-approved definition for net carbs" and recommends using total carbohydrates on the Nutrition Facts label.[2] Diabetes UK gives the same advice for UK products: count the total amount of carbs.[7]

That is why we give no formula for net carbs. Count total carbs and read that one line. This is especially important in the UK: because UK back-of-pack labels already list fibre separately from carbohydrate, subtracting fibre from a UK label deducts it twice and underestimates your carbohydrate intake.[4][7][8]

Sugar alcohols are the usual reason people want to subtract carbs. The FDA says they produce a smaller change in blood glucose.[11] Smaller isn't none. Listing them under Total Carbohydrate is voluntary unless a claim is made.[11] Foods with sorbitol or mannitol must state that "excess consumption may have a laxative effect."[11] A narrative review also reports side effects of sugar alcohols at normal as well as higher doses.[12]

If you dose insulin from carbohydrate counts, talk to your diabetes team before you subtract anything. They know your ratios and your medicines.

Term on the pack. What the sources say. Practical point.
Total carbohydrate.[1][2] Includes sugar, starch and fibre. The ADA recommends it.[1][2] Count this line first.[1]
Net carbs.[2] No FDA-approved definition.[2] Read it as marketing and check the back panel.[2]
Sugar alcohols.[11] A smaller change in blood glucose. Listing is voluntary without a claim.[11] Ask your team before subtracting them. Large amounts can cause a laxative effect.[11]
Of which sugars (UK).[7] Not the figure to count. Diabetes UK says count total carbs.[7] Use it to spot sugary products, not to plan carbs.[7]

What does sugar free actually mean?

What sugar free means on a label is narrow. The US sugar free label meaning is less than 0.5 g (0.02 oz) of sugars per reference amount and per labelled serving.[3] It says nothing about starch. A sugar free biscuit or cereal can still carry plenty of carbohydrate. The total carbohydrate on a food label still needs reading. In the UK and EU, "sugar-free" means no more than 0.5 g (0.02 oz) of sugars per 100 g (3.5 oz) or 100 mL (3.4 fl oz).[13]

"No added sugar" means no sugars or sugar-containing ingredients were added during processing. "Reduced sugar" is a defined claim. It needs at least 25 percent less sugar than a reference food.[3]

Total Sugars includes naturally present sugars as well as added ones.[6] The FDA gives a yogurt example: 7 g (0.25 oz) added sugars plus 8 g (0.28 oz) natural sugars shows as 15 g (0.5 oz) total sugars.[14]

The ADA says nonnutritive sweeteners can replace sugar-sweetened products if used in moderation and for the short term.[15] Our post on natural and artificial sweeteners goes into more detail.

How do serving sizes trip people up?

Every number on the panel belongs to one serving, and your plate may hold two. The FDA tells shoppers to watch how many servings are in the package.[6] The NHS warns that "the manufacturer's idea of a portion may be different from yours."[4]

In the type 1 study the mean gap between patients' estimates and a dietitian's was 15.4 g (0.54 oz). That was 20.9% of the meal's carbohydrate.[5] A study of 74 adults with type 1 diabetes found test-meal carbohydrate underestimated by 28%.[16] Neither tested label reading.

The fix is simple. Weigh or measure the food once, read the serving on the label and multiply. Say a label shows 30 g (about 1 oz) of carbohydrate per serving and you eat two servings. You ate 60 g (about 2 oz). That example is invented to show the sum.

Does counting carbs from labels actually help?

It is a tool, not a promise. The ADA Standards of Care 2026 say "monitoring carbohydrate intake is a key strategy in reaching glucose goals."[15] The same document reports a meta-analysis with no significant A1C difference for carb counting versus standard education.[15]

So label reading helps you see what you eat. It does not by itself make your HbA1c (A1C) steadier. For many nonpregnant adults, the ADA sets a general A1C goal below 7% (53 mmol/mol), pre-meal glucose of 4.4 to 7.2 mmol/L (80 to 130 mg/dL), and peak post-meal glucose below 10.0 mmol/L (180 mg/dL), though your clinician sets your personal targets.[17] Our guide to carbohydrates and blood sugar explains how different carbs behave.

If you use insulin or similar medicines, know the signs of low blood sugar. Read our page on low blood sugar signs and recovery. Labels also help you measure exactly 15 g (about 0.5 oz) of fast-acting carbohydrate if your glucose drops below 3.9 mmol/L (70 mg/dL).[17] The NHS uses below 4 mmol/L (72 mg/dL).[18] Lows are more likely with insulin or a sulfonylurea such as gliclazide or glimepiride.[18] Call 999 in the UK (or 911 in the US) if someone with low blood sugar is unconscious or not responding normally, if glucagon is not available, or if they have not recovered within 10 minutes of having glucagon. The NHS also says to call if they are unconscious and have been drinking alcohol.[18] In the US, call 911 for a severe low.[17]

Which label claims are marketing, not nutrition?

The front of a pack is advertising. The ADA Diabetes Food Hub notes that the FDA has no rules for keto, paleo or low-carb claims.[2] Even "net carbs" belongs in this group, since it has no FDA-approved definition.[2] The Nutrition Facts panel on the back is the regulated part.

"Sugar free," "no added sugar" and "reduced sugar" do have legal definitions. Each one tells you about sugars only.[3] None gives the carbohydrate total.

What is a quick label routine for the shop?

Use these five checks in the shop. Our guide to smart nutrition choices helps with the weekly plan.

  1. Find the serving size and the servings per package.[6]
  2. Read Total Carbohydrate for the portion you will actually eat.[1]
  3. Glance at fibre and sugars, and at the added sugars line in the US.[6]
  4. Ignore front-of-pack claims such as "net carbs" or "keto" until you've checked the panel.[2]
  5. Recheck products you buy often, since recipes change.[7]
Pro Tip

Weigh your usual bowl of cereal, cooked rice or pasta on kitchen scales once. Then compare it with the label's serving size, for example a 30 g (1 oz) cereal serving against a typical 60 g (2 oz) pour. The FDA notes that the serving size is not a recommendation of how much to eat.[6]

Questions to ask your diabetes team

  • What daily carbohydrate target suits me, and how many carb choices per meal?[1]
  • Should I ever subtract fibre or sugar alcohols from the total on a label?[2][11]
  • How should I adjust my insulin dose to the carbohydrate on a label?[15]
  • What should I do if my glucose drops below 4 mmol/L (72 mg/dL)?[18]

Frequently asked questions

Should I count net carbs or total carbs with diabetes?

Count total carbohydrate. If you use insulin, ask your diabetes team before subtracting fibre or sugar alcohols. The ADA Diabetes Food Hub says there is no FDA-approved definition for "net carbs" and recommends using total carbohydrates on the Nutrition Facts label.[2]

Does sugar free mean I can ignore the carbohydrate?

No. In the US, "sugar free" means less than 0.5 g (0.02 oz) of sugars per serving, and the food can still contain starch.[3] The ADA says the Total Carbohydrate line includes sugar, starch and fibre, so that line is the one to read.[1]

Is the UK traffic light label enough on its own?

Not for carbohydrate counting. The UK scheme combines colour coding with percentage reference intakes, and it is voluntary.[9] Diabetes UK says to count the total amount of carbs, not the "of which sugars" value.[7]

How accurate are my own carb estimates?

Often less accurate than people expect. Measuring portions and reading the label leaves less room for guesswork, and your clinician can say what error matters for your doses. In 50 adults with type 1 diabetes, 63% of 448 meals were underestimated, with an average gap of 15.4 g (0.54 oz) per meal.[5]

How do you read nutrition labels for diabetes?

Check the serving size first, then the total carbohydrate line. The ADA names these as the two label items to check, and says the carbohydrate figure includes sugar, starch and fibre.[1] US labels give values per serving. UK labels give them per 100 g (3.5 oz), so work out your own portion.[6][4]

Where to go next

Checking the serving size and the total carbohydrate on the back panel is the label habit that matters most.

Note: If you are pregnant, breastfeeding, or considering giving any supplement or herbal product to a child, consult your healthcare provider before making any changes to your diet, supplement routine, or prescribed medications.

Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Talk to your doctor before changing your diet, your activity or your medicines, and before starting any supplement.

Sources & References

  1. American Diabetes Association. "Carb Counting and Diabetes." Accessed October 2026. diabetes.org Funding: not applicable, this is official guidance, not a funded study.
  2. American Diabetes Association Diabetes Food Hub. "Nutrition-Related Claims You Should Know About." Accessed October 2026. diabetesfoodhub.org Funding: not applicable, this is official guidance, not a funded study.
  3. Electronic Code of Federal Regulations. "21 CFR 101.60, nutrient content claims for sugar (version dated 1 October 2026)." Accessed October 2026. www.ecfr.gov Funding: not applicable, this is official guidance, not a funded study.
  4. NHS. "How to read food labels." Accessed October 2026. www.nhs.uk Funding: not applicable, this is official guidance, not a funded study.
  5. Brazeau AS, et al. "Carbohydrate counting accuracy and blood glucose variability in adults with type 1 diabetes." Diabetes Res Clin Pract (2013). pubmed.ncbi.nlm.nih.gov/23146371 Funding: none listed on the PubMed record. COI: no statement on the PubMed record.
  6. U.S. Food and Drug Administration. "How to Understand and Use the Nutrition Facts Label." Accessed October 2026. www.fda.gov Funding: not applicable, this is official guidance, not a funded study.
  7. Diabetes UK. "Learn about carb counting." Accessed October 2026. www.diabetes.org.uk Funding: not applicable, this is official guidance, not a funded study.
  8. Regulation (EU) No 1169/2011 on the provision of food information to consumers, Annex I, definitions of "carbohydrate" and "fibre" (retained in UK law). Accessed October 2026. www.legislation.gov.uk Funding: not applicable, this is official guidance, not a funded study.
  9. GOV.UK. "Front of pack nutrition labelling guidance (page last updated 8 November 2016)." Accessed October 2026. www.gov.uk Funding: not applicable, this is official guidance, not a funded study.
  10. Song J, et al. "Impact of color-coded and warning nutrition labelling schemes: A systematic review and network meta-analysis." PLoS Med (2021). pubmed.ncbi.nlm.nih.gov/34610024 Funding: Department of Health (grants listed on PubMed). COI: I have read the journalā€™s policy and the authors of this manuscript have the following competing interests: JS is funded, and GAM and FJH are partially funded by the National Institute for Health Research (NIHR) (16/136/77) using UK aid from the UK Government to support global health research. The views expressed in this publication are those of the authors and not necessarily those of the NIHR or the UK government. GAM is the chair of Blood Pressure UK, Action on Salt, Sugar and Health and World Action on Salt, Sugar and Health (WASSH). FJH is a member of Action on Salt, Sugar and Health and WASSH. Blood Pressure UK, Action on Salt, Sugar and Health and WASSH are nonprofit charitable organizations. GAM and FJH do not receive any financial support from them. MKB is funded by the Medical Research Council/UK Research and Innovation under the Newton Fund Impact Scheme call (grant MR/V005847/1) and Vital Strategies. JW is the Director of the WHO Collaborating Centre on Population Salt Reduction, is supported by a National Heart Foundation Career Development Fellowship (1082924), and through an NHMRC Centre of Research Excellence on food policy interventions to reduce salt (1117300). KT is supported by an NHMRC Early Career Fellowship (1161597) and a Postdoctoral Fellowship (102140) from the National Heart Foundation of Australia. NRCC reports personal fees from Resolve to Save Lives (RTSL), and the World Bank outside the submitted work; and an unpaid consultant on dietary sodium and hypertension control to numerous governmental and non-governmental organisations.
  11. U.S. Food and Drug Administration. "Interactive Nutrition Facts Label: Sugar Alcohols." Accessed October 2026. www.accessdata.fda.gov Funding: not applicable, this is official guidance, not a funded study.
  12. Msomi NZ, et al. "Erythritol: an in-depth discussion of its potential to be a beneficial dietary component." J Food Drug Anal (2021). pubmed.ncbi.nlm.nih.gov/35696228 Funding: none listed on the PubMed record. COI: Conflict of interest . The authors declare no conflict of interests.
  13. Regulation (EC) No 1924/2006 on nutrition and health claims made on foods, Annex, "Sugars-free" (retained in UK law). Accessed October 2026. www.legislation.gov.uk Funding: not applicable, this is official guidance, not a funded study.
  14. U.S. Food and Drug Administration. "Added Sugars on the Nutrition Facts Label." Accessed October 2026. www.fda.gov Funding: not applicable, this is official guidance, not a funded study.
  15. American Diabetes Association Professional Practice Committee for Diabetes. "5. Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes-2026." Diabetes Care (2026). pubmed.ncbi.nlm.nih.gov/41358898 Funding: none listed on the PubMed record. COI: Duality of interest information for each contributor is available at https://doi.org/10.2337/dc26-SDIS.
  16. Buck S, et al. "Evaluation of Meal Carbohydrate Counting Errors in Patients with Type 1 Diabetes." Exp Clin Endocrinol Diabetes (2022). pubmed.ncbi.nlm.nih.gov/34034353 Funding: none listed on the PubMed record. COI: GF is general manager and medical director of the Institut fĆ¼r Diabetes-Technologie Forschungs- und Entwicklungsgesellschaft mbH an der UniversitƤt Ulm, Ulm, Germany, which carries out clinical studies on the evaluation of BG meters, with CGM systems and medical devices for diabetes therapy on its own initiative and on behalf of various companies. GF/IDT have received speakersā€™ honoraria or consulting fees from Abbott, Ascensia, Dexcom, LifeScan, Menarini Diagnostics, Metronom Health, Novo Nordisk, PharmaSense, Roche, Sanofi, Sensile, and Ypsomed. SB, CK, DW, CL, NJ, and CH are employees of the IDT. JH and BP declare no conflicts of interest.
  17. American Diabetes Association Professional Practice Committee. (2026). 6. Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises: Standards of Care in Diabetes-2026. Diabetes Care, 49(Suppl 1). pubmed.ncbi.nlm.nih.gov/41358894 Funding: none listed on the PubMed record. COI: Duality of interest information for each contributor is available at https://doi.org/10.2337/dc26-SDIS.
  18. NHS. "Low blood sugar (hypoglycaemia)." Checked 1 November 2026. www.nhs.uk Funding: not applicable, this is official guidance, not a funded study.
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