How to reduce sugar intake: a practical 30g-a-day plan

Updated 2026-08-07 · by the SugarCoachAI team

The most effective way to reduce sugar is to cap added and squeezed sugar at 30g a day (about 7 sugar cubes — the NHS adult guideline), check foods before you eat them rather than logging after, and replace your top 2–3 sugar sources with like-for-like swaps you actually enjoy. Most people's sugar comes from a handful of repeat offenders — drinks, cereals, sauces and "healthy" snacks — so fixing those few habits removes most of the sugar.

1. Know the real target: 30g of "free sugar" a day

The NHS and WHO guideline for adults is no more than 30g of free sugar per day — that's added sugar plus the sugar in juice, honey and syrups. Whole fruit doesn't count. Most UK adults eat roughly double that without realising.

2. Find your hidden sugar

The biggest sources are rarely desserts. Check these first:

Drinks — a 500ml smoothie or a flavoured latte can be 25–45g on its own.
Breakfast cereals and granola — often 10–20g per bowl, before milk.
Sauces — ketchup, sweet chilli, teriyaki and pasta sauces add up fast.
"Healthy" snacks — protein bars, yoghurt drinks, dried fruit and cereal bars are frequent 🔴 reds.

3. Swap, don't ban

Bans fail; swaps stick. Same shop, same shelf, less sugar: porridge instead of granola, sparkling water with lime instead of cola, full-fat plain yoghurt with real berries instead of a "fat-free" fruit yoghurt, a flat white instead of a syrup latte.

4. Check before, not after

Calorie-tracker apps ask you to log what you already ate — the decision is over. The habit that works is checking before you order or eat, so a red verdict can still change the choice.

5. Expect week one to be the hardest

Cravings typically peak in the first 3–7 days and fall noticeably by week two. Protein-rich breakfasts, regular meals and sleep make the drop easier.

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Common questions

How much sugar per day is OK?

UK NHS guidance for adults: no more than 30g of free (added and squeezed) sugar a day — about 7 sugar cubes. Sugar naturally present in whole fruit, vegetables and plain milk does not count.

Is fruit sugar bad?

Whole fruit is fine for most people — the fibre slows the sugar. Fruit juice and smoothies count as free sugar because the fibre is broken down, so treat them like a sugary drink.

What are the worst hidden-sugar foods?

Flavoured coffees, smoothies, granola, cereal bars, flavoured yoghurts, ketchup and cooking sauces, and most "low-fat" products, which often replace fat with sugar.

This guide is general lifestyle education, not medical advice. If you have diabetes, prediabetes or any medical condition, changes to your diet should be made with your healthcare team.