- The ingredients list is one of the most useful parts of a food label, ingredients are listed by weight, so what appears first makes up the most of what you’re eating.
- Labels can legally state “0g trans fat” per serving even when trans fat is present, always check for “partially hydrogenated oils” in the ingredients list.
- Use the per 100g column to compare products fairly, serving sizes vary widely and can be misleading.
- Aim for at least 3g of fiber per serving ideally 5g or more, when choosing packaged grain products, cereals, or breads.
- Sodium under 120mg per 100g is considered low; over 400mg is high. Added sugars hide under many names, glucose, fructose, malt syrup, and corn syrup are all sugar.
- “Healthy,” “high protein,” and “plant-based” claims on the front of a packet don’t guarantee the product is good for your heart, the ingredients list tells the real story.
Food packaging is designed to grab your attention with bold claims, colors, and feel-good phrases. But turn the packet around and you’re often met with a wall of numbers, percentages, and unfamiliar ingredients. Trying to make a healthy choice can feel more complicated than it should be.
Many of us want to eat better, but between inconsistent serving sizes, shrinking packaging, and confusing nutrition panels, knowing where to start is genuinely tricky. This guide is here to help cut through the clutter and make more informed choices, one label at a time.
Start with the Ingredients List
The ingredients list is one of the most important, and most overlooked, parts of any food label. Ingredients are listed in descending order by weight, which means the first few items make up the bulk of what you’re eating.
Look for whole, recognisable foods near the top, oats, wholemeal flour, legumes, vegetables. Be cautious when sugar, salt, or refined oils appear in the first few ingredients. And pay attention to the length of the list overall, a long string of additives, numbers, and chemical-sounding names is a reliable signal that the product is heavily processed, regardless of what the front of the pack claims.
If it’s not something you’d use in your own kitchen, it might be better left on the shelf.
Watch for Trans Fats, Even When the Label Says Zero
Trans fats are artificial fats strongly linked to raised LDL cholesterol and increased cardiovascular risk. Many countries have moved to restrict or ban them from the food supply, but they can still appear in some packaged baked goods, snacks, and spreads.
The catch: food labels are legally permitted to display “0g trans fat” per serving if the amount is less than 0.5g, which means a product can contain trans fat and still show zero on the panel. The only reliable way to check is to look at the ingredients list for the words “partially hydrogenated oils.” If that phrase appears, trans fat is present, regardless of what the nutrition panel states.
Even small amounts consumed regularly over time can have a cumulative effect on heart health, making this one of the more important label-reading habits to develop.
Ultra-Processed Doesn’t Mean Ultra-Healthy
Not all food processing is harmful, freezing vegetables, canning legumes, and fermenting dairy are all forms of processing that don’t compromise nutritional value. But ultra-processed foods, those made largely from industrially refined ingredients with multiple additives, are a different category, and the evidence linking them to cardiovascular risk is growing.
The issue is that many ultra-processed products are marketed with health halos: “high protein,” “plant-based,” “low fat,” “natural.” These front-of-pack claims can be technically accurate while the product itself remains nutritionally poor. A plant-based snack bar with 15 ingredients including multiple syrups, emulsifiers, and refined starches is not the same as a handful of nuts, even if both carry similar marketing language.
A long ingredients list filled with numbers, stabilisers, emulsifiers, and artificial flavour enhancers is a practical indicator of heavy processing, whatever the front of the pack says.
The Fiber Number Worth Checking
Fiber is one of the most consistently heart-protective nutrients in the diet, yet many products marketed as high-fiber fall well short of meaningful amounts. Some cereals and breads contain as little as 2g of fiber per serving, not enough to make a real difference.
When choosing packaged grain products, cereals, or breads, aim for at least 3g of fiber per serving and ideally 5g or more. The best whole food sources of fiber, rolled oats, legumes like lentils and chickpeas, wholegrain or seeded bread, and fresh fruit and vegetables with their skin on, consistently deliver more than packaged alternatives, and usually without the additives. For more on why fiber matters for the heart, see our article on dietary fiber and heart health.
Don’t rely on the front of the box, always check the actual fiber number on the back.
Salt and Sugar, The Quiet Contributors
Salt and added sugars are among the most significant contributors to cardiovascular risk in the modern diet, and both are reliably underestimated because they hide so effectively in everyday foods, not just obviously salty or sweet ones.
Sodium
Sodium, the cardiovascular concern in salt, appears in sauces, dressings, crackers, cereals, and many foods that don’t taste noticeably salty. Use the per 100g column to assess:
| Sodium per 100g | Rating |
|---|---|
| Under 120mg | Low, a good choice |
| 120mg–400mg | Moderate, fine in context |
| Over 400mg | High, worth reconsidering or limiting portion |
Added Sugar
Sugar appears under many names on ingredients lists, glucose, fructose, sucrose, malt syrup, rice syrup, corn syrup, and high-fructose corn syrup among them. High-fructose corn syrup in particular has been associated with weight gain and metabolic stress when consumed regularly in large amounts.
If any form of sugar appears among the first three or four ingredients, the product likely contains more than you need, even if it doesn’t taste particularly sweet.
Serving Sizes, The Numbers That Don’t Reflect Reality
One of the most reliably misleading aspects of food labelling is the serving size. Products often list serving sizes that bear little resemblance to how people actually eat, a small bottle listed as two servings, a single-portion bag listed as three, a cereal serving of 30g when most people pour 60g or more.
The most practical solution is to ignore the per-serving column for comparison purposes and use the per 100g column instead. This gives a consistent basis for comparing two products side by side, regardless of how their serving sizes are defined.
Next time you pick up a packaged product, run through these five checks before it goes in the basket:
- Ingredients list are the first few items whole, recognisable foods?
- Partially hydrogenated oils if present, put it back regardless of what the trans fat line says
- Fiber (per 100g) aim for 5g or more in grain-based products
- Sodium (per 100g) under 120mg is low; over 400mg is high
- Sugar position in ingredients if it appears in the first three or four ingredients, sugar is a major component
One More Tool Worth Knowing About
Food tracking apps that allow barcode scanning can be a genuinely useful shortcut, many will instantly display a breakdown of nutrients, flag concerning ingredients, and allow quick comparisons between products. They’re particularly helpful when you’re short on time or learning to read labels for the first time. They’re a tool, not a replacement for understanding what you’re looking at, but used alongside the habits above, they can make the process considerably faster.
Conclusion
Food labels aren’t always designed to make your life easier, but learning to read them gives you real and practical power over what ends up on your plate. Start with the ingredients list. Use the per 100g column for comparisons. Check for partially hydrogenated oils. Look at fiber and sodium numbers rather than relying on front-of-pack claims.
You don’t need to get it perfect every time. Even small improvements made consistently, choosing a higher-fiber bread, spotting a hidden sodium source, recognising a misleading serving size, add up meaningfully over time in support of a healthier heart.
