How to Use AI to Understand Food Labels

Food labels are packed with useful information, but reading them in a busy supermarket aisle can feel like a maths test. Per 100g or per portion? What’s a reference intake? Is amber good or bad? Why does the “healthy” granola have more sugar than the biscuits? It’s no wonder many of us just grab what we usually buy.

AI can help you get confident with labels. It can explain the traffic light system and reference intakes in plain English, compare two products from photos or pasted nutrition panels, translate long ingredients lists and help you spot allergens. It’s a helpful learning aid, but always check allergy information on the actual packet, and if you have a medical condition, follow advice from your GP or dietitian. This guide takes about 20 minutes.

What you’ll need

• A few food products you buy often, or photos of their labels
• An AI chatbot, ideally one that can read photos
• The NHS guide to reading food labels for reference
• About 20 minutes

Step-by-step: understand food labels with AI

1. Learn the basics. Ask the AI to explain the front-of-pack label: the traffic light colours for fat, saturated fat, sugars and salt, and the percentage of reference intake (prompt 1).
2. Read one label together. Upload a photo or type in the nutrition panel of something you eat often, and ask for a plain-English breakdown (prompt 2).
3. Compare per 100g. Portion sizes vary, so per 100g is the fairest way to compare. Ask the AI to compare two or three products (prompt 3).
4. Look at the ingredients. Ingredients are listed in order of weight, so the first few matter most. Ask the AI to explain unfamiliar ingredients and spot different names for sugar.
5. Check allergens on the packet. In the UK, the 14 major allergens are emphasised in the ingredients list, for example in bold. Read the actual label every time, as recipes change.
6. Make swaps. Ask the AI for realistic swaps for foods you eat often (prompt 4), such as a lower-salt stock cube or a breakfast cereal with less sugar.
7. Practise in the shop. After a few goes, you’ll be able to read labels quickly without help.

Copy-paste prompts

1. Explain food labels simply

Explain UK food labels to me in plain English: what the red, amber and green traffic light colours mean for fat, saturated fat, sugars and salt, what "reference intake" means, and the difference between "per 100g" and "per portion". Give me three quick rules of thumb for using them in the supermarket.

2. Break down this label

Here's the nutrition information from a product I eat often: [PASTE OR UPLOAD LABEL]. A typical portion for me is [AMOUNT].
Explain what this tells me in plain English: which nutrients are high, medium or low, how my portion compares with the daily reference intakes, and what stands out in the ingredients. Don't tell me what to eat; just help me understand it.

3. Compare products

Compare these products per 100g: [PASTE NUTRITION INFO FOR 2 OR 3 PRODUCTS].
Show a table of energy, fat, saturates, sugars, salt and fibre, with traffic light colours based on UK guidance. Tell me which is lower in sugar, salt and saturated fat, and point out anything surprising.

4. Healthier swaps

These are foods I buy every week: [LIST]. I'd like to eat less [SUGAR / SALT / SATURATED FAT] and more fibre, without spending much more or giving up foods I enjoy.
Suggest one realistic swap for each item and what to look for on the label when choosing.

Recommended tools

• ChatGPT: can read label photos on many plans and explain them clearly.
• Gemini: works with photos and Google Lens.
• Claude: good at clear comparisons and tables.
• Grok: quick for on-the-spot questions.
• NHS: official guidance on reading food labels.

Tips and mistakes to avoid

• Always check allergens yourself. AI can misread photos or miss things. If you have an allergy, read the packet every time.
• Compare per 100g. Portion sizes on packs are often smaller than what people actually eat.
• Don’t fear one red light. Labels help you compare and balance your diet; an occasional treat is fine.
• Watch for “health halo” claims. “Natural”, “light” or “high protein” doesn’t mean low in sugar or salt.
• Check sugar names. Glucose syrup, honey, dextrose and fruit juice concentrate are all sugars.
• Look at fibre. Wholegrain and higher-fibre products help keep you full.
• Get personal advice if needed. For diabetes, kidney disease or other conditions, ask your GP or a dietitian.

FAQ

What does “reference intake” mean?

It’s a guide to the maximum amount of energy and certain nutrients an average adult should have in a day. Children and people with different needs will vary.

Are traffic light labels compulsory?

Front-of-pack traffic light labels are voluntary in the UK, but most major supermarkets use them. Nutrition information on the back is required on most pre-packed food.

Can AI tell me if a food is healthy?

It can help you understand the label, but “healthy” depends on your overall diet, portion sizes and needs.

Do loose foods like bread from the bakery have labels?

Food sold loose or made on the premises doesn’t usually carry a full label, but businesses must still be able to tell you about allergens. Just ask the staff.

Explain UK food labels to me in plain English: what the red, amber and green traffic light colours mean for fat, saturated fat, sugars and salt, what "reference intake" means, and the difference between "per 100g" and "per portion". Give me three quick rules of thumb for using them in the supermarket.

Related guides

• How to use AI to plan healthy meal prep for the week
• How to use AI to cook for allergies and intolerances
• How to use AI to plan weekly meals on a budget

Reference: NHS: Food labels