Nutrition Basics: Reading Labels Without Getting Fooled

In the US the Nutrition Facts panel is standardised, which makes products genuinely comparable once you know what to look at.

Serving size comes first, always

Every number on the panel refers to one serving, and serving sizes are frequently smaller than what people actually eat. A bottle of drink may contain two or more servings, so the calorie figure shown is a fraction of the bottle.

The FDA's 2016 label update required serving sizes to better reflect typical consumption and added a dual-column format for packages that might be eaten in one sitting. Check whether you are reading the per-serving or per-package column.

Compare products on the same basis, ideally per 100 grams where available, since differing serving sizes make per-serving comparisons misleading.

Added sugars, now separated

The updated US label distinguishes total sugars from added sugars, which is a meaningful improvement. Naturally occurring sugars in fruit and dairy come packaged with fibre, water and nutrients; added sugars do not.

Dietary guidance generally suggests limiting added sugars to a modest proportion of daily calories. The practical difficulty is that added sugars appear across savoury products — sauces, breads, dressings, cured meats — not only in obvious sweets.

In the ingredients list, sugar appears under many names: sucrose, high fructose corn syrup, dextrose, maltose, cane juice, agave, honey, molasses, fruit juice concentrate. Splitting sugar across several such ingredients moves each further down the list while the total remains the same.

The ingredients list is ordered by weight

Ingredients appear in descending order by weight, so the first three or four make up most of the product. A cereal listing whole grain first differs meaningfully from one listing sugar first.

Shorter lists are not automatically better, and long lists are not automatically bad — many entries are vitamins, minerals or standard preservatives. But a list dominated by refined starches, sugars and oils tells you what the product mostly is.

Fats, sodium and fibre

Saturated fat and trans fat are listed separately. Artificial trans fats from partially hydrogenated oils have been largely eliminated from the US food supply following FDA action, though products may still list small amounts as zero if below the rounding threshold — checking the ingredients for partially hydrogenated oils catches this.

Sodium is worth watching because most intake comes from processed and restaurant food rather than the salt shaker. Guidance commonly suggests staying under 2,300 mg daily, and many single processed meals approach a large fraction of that.

Fibre is under-consumed by most people and is associated with better digestive and cardiovascular outcomes. Whole grain products, legumes and vegetables are the practical sources.

Claims and what they legally mean

Some claims are regulated. 'Low fat', 'reduced sodium' and 'good source of' have defined thresholds. 'Healthy' has a regulated definition that the FDA has been updating.

Others mean little. 'Natural' is loosely defined for most foods. 'Made with whole grains' does not indicate how much. 'Multigrain' means several grains, not whole ones. 'No added sugar' does not mean low sugar. 'Light' may refer to colour or texture rather than calories, though it is regulated for some uses.

Front-of-pack symbols from manufacturers are marketing devices. Independent certifications vary in rigour.

A practical routine

Turn the package over. Check the serving size and how many servings you will actually eat. Look at added sugars, sodium, saturated fat and fibre. Read the first four ingredients. Then decide.

This takes about twenty seconds and is more informative than any front-of-pack claim. Most useful of all: the foods with the best nutritional profiles frequently carry no claims at all, because vegetables, legumes, eggs and plain oats have no marketing budget.