RealFoods vs Lifesum: Which App Fits You?

Two different theories of why weight loss stalls

Lifesum's thesis: you're eating more than you should, so tracking calories and macros against a daily budget will close the gap. Its meal plans, food database, and premium recipes all serve this framework.

RealFoods' thesis: if insulin is high often enough, stored fat may be released more slowly, so what you eat may matter alongside how much (high insulin slows the release of stored fat, per Jensen et al., Diabetes, 1989). Human evidence for that view is early: in an exploratory analysis led by Dr. Benjamin Bikman, fat-tissue samples from 27 adults following a 60% carbohydrate eating pattern for 10 to 15 weeks showed lower mitochondrial respiration in the lab than samples from people eating less carbohydrate (Bikman et al., 2022). The Weight Impact Score is built on that idea: it reports the insulin impact of a meal, not its calorie content.

Side by side

Competitor details checked October 6, 2026, against Lifesum's US App Store listing, help center and website. Prices change and vary by region.

Where Lifesum's approach breaks down

Lifesum's food database and calorie logic are well-executed. The problem is structural: two meals with identical macro profiles can produce very different insulin responses. In one trial, the same white rice had a glycemic index of 96 eaten alone and 50 eaten with chicken, oil and a leafy vegetable (Sun et al., 2014). On the glycemic index, for example, white rice sits far above lentils, a difference a carbohydrate-gram count does not capture. Your body does not experience them the same way.

This is the core limitation of macro tracking for weight loss: it measures the quantity of carbohydrates, not their metabolic quality. Two users logging identical macro targets in Lifesum, one eating refined carbohydrates and one eating whole foods, are likely to see different insulin responses, and on the carbohydrate-insulin model that difference may matter for how easily stored fat is released.

We report insulin impact instead because equal calories can call for very different amounts of insulin: in the insulin index study, 240 kcal portions of boiled potatoes and eggs produced insulin responses of 121 and 31, against 100 for white bread (Holt et al., 1997).

Ready to stop guessing what to eat?

Who should pick which

• Pick Lifesum if: you want precise calorie and macro targets, you enjoy meal planning from a curated library, and you are already eating primarily whole foods.
• Pick RealFoods if: you have tried calorie or macro counting and hit a wall, your meals look healthy on paper but the scale is not moving, or you want to understand the insulin impact of food rather than just the numbers.

Common questions

What is the main difference between Lifesum and RealFoods?

Lifesum is a macro and calorie tracker. You set a daily calorie and macro target, then log foods from its database to hit those numbers. RealFoods does not count calories or macros. Instead, it scores every meal from 1 to 10 by its estimated insulin response, the hormonal signal that RealFoods argues plays a large part in whether the body is likely to keep burning fat after a meal.

Is Lifesum good for weight loss?

Lifesum can support weight loss for users who are disciplined about logging and comfortable with counting calories. Its limitation, shared by all calorie trackers, is that it ignores insulin response. Two meals with identical calorie and macro counts can produce very different blood sugar and insulin responses, which may be one reason some users log carefully in Lifesum and still see little progress.

Does RealFoods track macros like Lifesum?

No. RealFoods does not ask you to count macros or hit macro targets. Each meal gets a Weight Impact score from 1 to 10 for its estimated insulin impact, shown with the main food traits behind it, so there are no macro numbers to chase.

How much does Lifesum cost compared with RealFoods?

Lifesum is free to download, and its US App Store listing shows Premium at $7.49 for one month, $14.99 for three months and $49.99 for one year as of October 2026, with regional variations. RealFoods is free to download, with barcode scans, product search and manual meals scored in full, and Premium (AI photo and text meal scoring) costs $9.99 a month or $59.99 a year after a 7-day free trial, as of October 2026 (shown in local currency in the App Store). Prices change, so compare the current listings and the plan length you would actually use.

For more on the underlying science, read why calorie counting leaves many people stuck or why "healthy" foods can still slow fat loss.

Lifesum is a trademark of its respective owner. This comparison reflects publicly available information at the time of writing and is provided for informational purposes only. RealFoods is not affiliated with, endorsed by, or sponsored by any of the products mentioned. Feature sets and pricing change, verify current details on each product’s official website before making a purchasing decision.