If the barcode doesn't return values for your product, enter the name and nutritional information yourself and log the entry as you normally would. Logging it saves that barcode to your own food database, so scanning it again afterward should pull it up automatically.

A product's nutritional info can change as manufacturers adjust portion sizes or ingredients. If a scan looks wrong, correct the values on the Add Food form before logging; that saves them to your barcode database, so future scans return the fixed numbers automatically. Editing an entry after it's already logged won't save the fix, so correct it at log time. Fix it once, and it's fixed for good.

It depends on your goal, whether that's losing weight, gaining weight, or building muscle, each needs different amounts of protein, carbs, and fat. Head over to the Settings tab, set your objective and activity level, then use Recalculate to get suggested macro targets you can apply directly, or enter your own numbers manually.

• Daily Defaults is for foods you eat almost every day: set it once and it logs itself automatically the first time you open the day, remove it that day if you skip it. • Meal Prep is for cooking in batches: build a meal from its ingredients, say how many portions it makes, then log off it over the following days until it runs out. • Fancy a Treat doesn't log anything at all, it's just a quick lookup to check a food's calories and how long it'd take to burn off before you decide whether to actually eat it.