Research shows that four popular eating patterns, time-restricted eating, high-protein diets, calorie-controlled balanced eating, and flexitarian diets, helped Chinese office workers lose weight within three weeks using a digital health app. A Gram Research analysis of 5,066 participants found that the flexitarian diet produced the largest weight loss at 1.06 kg/m² BMI reduction, while time-restricted eating reduced BMI by 0.46 kg/m². However, these results represent short-term changes over about 19 days, and longer-term effectiveness remains unknown.
A new study of over 5,000 Chinese office workers found that several popular eating plans helped people lose weight in just a few weeks. Researchers looked at people using a weight-loss app who chose their own diet style, including time-restricted eating, intermittent fasting, high-protein diets, and calorie-controlled plans. The study found that four of these approaches led to measurable weight loss in a short time. However, the results only lasted about three weeks, so researchers say more long-term studies are needed to see which diets work best over months or years.
Key Statistics
A 2026 real-world observational study of 5,066 Chinese office workers found that the flexitarian diet produced the largest short-term BMI reduction at -1.06 kg/m² over a median follow-up of 19 days.
According to research reviewed by Gram, time-restricted eating (16:8 method) resulted in a -0.46 kg/m² BMI reduction among 5,066 office-based adults using a digital weight-management platform in China.
A 2026 study of 5,066 participants found that calorie-restricted balanced diets were the most popular dietary choice (selected by 39.42% of users) and produced a -0.30 kg/m² BMI reduction over three weeks.
Research shows that among four effective dietary patterns tested, the flexitarian diet showed the strongest weight loss results, though all four approaches produced statistically significant BMI reductions in office workers over a 19-day period.
The Quick Take
- What they studied: Whether different eating plans that people choose themselves actually help them lose weight when using a digital health app
- Who participated: 5,066 Chinese office workers (mostly women, average age 31) who picked their own diet approach and tracked their weight on a smartphone app for about three weeks
- Key finding: Four eating patterns, time-restricted eating (eating only during an 8-hour window), high-protein diets, calorie-controlled balanced eating, and flexitarian diets, all led to small but real weight loss in the short term
- What it means for you: If you work in an office and want to lose weight quickly, several popular diet approaches can work, but you should expect modest results over a few weeks. The study doesn’t prove one diet is better than others, and longer-term results remain unknown
The Research Details
Researchers collected real-world data from a Chinese weight-loss app between September and October 2024. They looked at office workers aged 18-60 who had recorded their starting weight and at least one follow-up weight measurement. The participants weren’t assigned to diets by researchers, instead, they voluntarily chose which eating plan to follow based on what seemed easiest for them. The researchers then compared weight changes between the different diet groups using statistical methods that accounted for age, sex, starting weight, and how long people tracked their progress.
This type of study is called ‘observational,’ which means researchers watched what happened naturally rather than controlling the experiment. The median follow-up time was just 19 days, about three weeks. The most popular choice was the calorie-restricted balanced diet (chosen by 39% of participants), while flexitarian and DASH diets were chosen by far fewer people.
This research matters because most diet studies are done in controlled lab settings where researchers tell people exactly what to eat. This study looked at what actually happens in real life when people choose their own diet based on what fits their lifestyle and culture. For Chinese office workers specifically, this shows which eating approaches people naturally gravitate toward and whether those self-chosen approaches actually produce weight loss.
Strengths: The study included a large number of real-world participants (over 5,000) using an actual weight-loss app, making the results relevant to how people actually diet. The researchers adjusted their analysis for important factors like age and starting weight. Limitations: The follow-up period was very short (about 3 weeks), so we don’t know if weight loss continues or if people regain it. The study was mostly women (94%), so results may not apply equally to men. Because people chose their own diets, we can’t be sure the diet itself caused the weight loss, other factors like motivation might matter. The study is observational, not a controlled experiment, so it shows association rather than proof of cause-and-effect.
What the Results Show
Four dietary approaches showed statistically significant weight loss. The flexitarian diet (eating mostly plant-based with occasional meat) produced the largest BMI reduction at -1.06 kg/m², which translates to roughly 3-4 pounds for an average person. Time-restricted eating (the popular 16:8 method where you eat only during an 8-hour window) resulted in a BMI reduction of -0.46 kg/m². The calorie-restricted balanced diet showed a -0.30 kg/m² reduction, and the moderate-to-high protein diet showed -0.28 kg/m² reduction.
Two dietary approaches, the 5:2 intermittent fasting (eating normally 5 days, restricting calories 2 days) and the DASH diet (designed to lower blood pressure), did not show statistically significant weight loss in this study. However, this doesn’t mean these diets don’t work; it may reflect the short follow-up period or the smaller number of people who chose these approaches.
When researchers compared all the diet groups against each other while accounting for age, sex, starting weight, and follow-up duration, they found meaningful differences in how much weight people lost across the different diet types. The calorie-restricted balanced diet was by far the most popular choice, selected by nearly 40% of all participants, suggesting office workers found it practical and sustainable.
The study revealed interesting patterns about which diets people choose. The calorie-restricted balanced diet’s popularity suggests office workers prefer straightforward approaches that don’t require complex meal timing or significant food restrictions. The very small number of people choosing flexitarian and DASH diets indicates these approaches may be less appealing to this population, despite the flexitarian diet showing the strongest weight loss results. This gap between what works and what people actually choose highlights the importance of diet acceptability and cultural fit.
According to Gram Research analysis, previous studies have shown that time-restricted eating and intermittent fasting can produce weight loss, but most research has been conducted in Western populations. This study extends that evidence to Chinese office workers and shows that self-selected dietary patterns in real-world settings produce similar modest weight losses to what controlled studies have found. The finding that calorie-restricted diets remain effective aligns with decades of nutrition research showing that reducing overall calorie intake remains a reliable weight-loss strategy. However, this study’s short timeframe means we can’t compare long-term effectiveness to previous longer-term studies.
The biggest limitation is the very short follow-up period, just 19 days on average (about 3 weeks). Weight loss in the first few weeks often includes water weight and may not reflect sustainable, long-term fat loss. The study population was 94% female and all were office-based workers in China, so results may not apply to men, manual laborers, or people in other countries. Because participants chose their own diets rather than being randomly assigned, we can’t prove the diet caused the weight loss, people who are highly motivated might lose weight on any diet. The study didn’t measure important factors like diet adherence, exercise, sleep, or stress, which all affect weight loss. Finally, the smaller diet groups (especially flexitarian and DASH) had fewer participants, making those results less reliable.
The Bottom Line
If you’re an office worker looking to lose weight in the short term, time-restricted eating, high-protein diets, and calorie-controlled balanced eating all show promise based on this research (moderate confidence level). The calorie-restricted balanced diet may be easiest to stick with since most people in this study chose it. However, expect modest weight loss (typically 1-3 pounds over 3 weeks) rather than dramatic results. For long-term weight loss, you’ll need to maintain your chosen approach beyond a few weeks, which this study doesn’t address. Consider consulting a healthcare provider or registered dietitian before starting any new diet, especially if you have health conditions.
This research is most relevant to office-based workers (particularly women) in China or similar cultural contexts who want to lose weight using a digital health app. The findings may apply to office workers in other countries, though cultural food preferences vary. People with medical conditions, those taking medications that affect weight, pregnant or breastfeeding women, and adolescents should not use these findings as medical advice without consulting a healthcare provider. The study doesn’t provide evidence for which diet is ‘best’, the best diet is the one you can stick with long-term.
Based on this study, you might expect to see modest weight loss (roughly 1-3 pounds) within 2-4 weeks if you follow one of the effective dietary patterns. However, this represents short-term results. To determine if weight loss continues beyond a month or becomes permanent, you would need to maintain the diet for several months, something this study didn’t measure. Most people experience the fastest weight loss in the first few weeks, with the rate slowing after that.
Frequently Asked Questions
Which diet works best for weight loss according to recent studies?
A 2026 study of 5,066 office workers found that flexitarian diets produced the largest weight loss (1.06 kg/m² BMI reduction), followed by time-restricted eating (0.46 kg/m²). However, the study lasted only three weeks, so long-term effectiveness remains unclear.
How much weight can I expect to lose with time-restricted eating?
In a recent study of 5,066 participants, time-restricted eating produced a BMI reduction of 0.46 kg/m² over about 19 days, roughly equivalent to 1-2 pounds for an average person. Results were modest and short-term.
Is calorie counting better than intermittent fasting for weight loss?
A 2026 study found that calorie-restricted balanced diets produced measurable weight loss (-0.30 kg/m²) and were the most popular choice among 5,066 office workers. The 5:2 intermittent fasting approach didn’t show significant results in this short-term study, though this may reflect the brief 3-week timeframe.
How long does it take to see weight loss results from these diets?
Research shows weight loss occurred within 19 days (about 3 weeks) in a study of 5,066 office workers. However, this represents short-term results; longer-term studies are needed to determine if weight loss continues or becomes permanent.
Can I trust weight loss results from apps and digital platforms?
A 2026 study using real-world data from a Chinese weight-loss app found that self-selected dietary patterns did produce measurable weight loss. However, the study lasted only three weeks, so app-based results should be viewed as short-term indicators rather than proof of long-term success.
Want to Apply This Research?
- Log your weight daily or every 3 days and track which dietary pattern you’re following. Set a goal to measure BMI or weight change over 4-week periods rather than daily fluctuations, since the study showed meaningful changes over about 3 weeks.
- Choose one of the four effective dietary patterns from this study (time-restricted eating, high-protein, calorie-controlled balanced, or flexitarian) based on which fits your lifestyle best. Start with a 4-week commitment and use the app to log meals and weight to see if you’re experiencing similar results to the study participants.
- Track weekly weight averages rather than daily weights, since daily fluctuations can be misleading. Monitor your adherence to your chosen diet pattern, the app can help by logging meals. After 4 weeks, assess whether you’ve lost weight similar to the study results (roughly 1-3 pounds). If successful, continue the pattern; if not, consider switching to a different dietary approach from the study’s effective options.
This research describes short-term weight changes (approximately 3 weeks) associated with self-selected dietary patterns among office-based adults using a digital health platform. The findings are observational and do not prove that any specific diet causes weight loss, other factors like motivation, exercise, and lifestyle changes may contribute. Results may not apply to all populations, as the study was 94% female and conducted in China. Before starting any new diet or weight-loss program, especially if you have existing health conditions, take medications, are pregnant or breastfeeding, or have a history of eating disorders, consult with a healthcare provider or registered dietitian. This article is for informational purposes only and should not be considered medical advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.
