Germany’s Heaviest Kids: The City Ranking
How much do childhood overweight and obesity vary between Germany’s major cities? A LANGWATER data analysis based on official school entry examinations and regional health data shows: the differences between cities are substantial. In this article, we explore why these gaps exist, what they mean for children’s long-term health, and share some good news: simple changes to how children drink can make a real difference.
Where a child lives shapes their weight – before school even starts
Most of the figures come from school entry examinations, which assess children aged five to six – before their first day of school. The regional differences therefore emerge early, in families’ everyday lives.
A regional pattern
Wuppertal, Gelsenkirchen and Duisburg top the obesity ranking, while Essen leads on overweight. Cities with high levels of social deprivation consistently show higher rates.
The leanest cities
Stuttgart (3.2%), Karlsruhe (3.5%) and Hanover (3.0%) record the lowest obesity rates. Dresden reports the lowest overweight figure, at under 8%.
Overweight and obesity across German cities
Two perspectives, one picture: overweight (incl. obesity) covers all children above the age-specific BMI reference, while obesity covers only those most severely affected. Figures show the share of examined children in percent.
16 of the 21 cities examined publish an overweight figure. Essen leads the ranking by a clear margin – its value comes from the city’s own child health report.
| Rank | City | Share of overweight children | Source / year |
|---|
19 of the 21 cities examined publish an obesity rate. At the top: Wuppertal, Gelsenkirchen and Duisburg – three cities in North Rhine-Westphalia.
| Rank | City | Share of obese children | Source / year |
|---|
Why the differences are so large
Childhood overweight is not a matter of chance. Research has long shown stable links with the social environment: parental income and education, the neighbourhood children grow up in, opportunities for physical activity – and, crucially, everyday family eating and drinking habits. The fact that cities with high social deprivation such as Gelsenkirchen and Duisburg top the obesity ranking, while economically strong cities in the southwest show the lowest rates, fits this picture exactly.
The timing is striking: most figures come from school entry examinations, meaning they capture children aged five to six. The course is set in the pre-school years – a phase of life in which parents still shape their children’s eating and drinking routines almost entirely.
For context: nationwide, according to the Robert Koch Institute’s KiGGS study, 15.4 percent of 3- to 17-year-olds are overweight, and almost 6 percent are obese. These rates have remained stubbornly high for years – and there is no room for complacency, as overweight children are far more likely to become overweight adults, with all the associated risks from diabetes to cardiovascular disease.
One city, twelve realities: Berlin by district
Berlin sits mid-table in the city ranking, with 11.4 percent of school starters overweight. But the average hides how far apart the districts really are: in Neukölln, 15.3 percent of school starters are overweight or obese – in Pankow, just 7.6 percent. Exactly a factor of 2 within a single city. The clear split is striking: six districts sit well above the Berlin average (12.9 to 15.3 percent) and six well below it (7.6 to 9.9 percent) – with a three-percentage-point gap in between that not a single district falls into.
Berlin in numbers
| Rank | District | Overweight incl. obesity | Breakdown |
|---|
What makes Berlin so revealing: all twelve districts follow the same education act, the same examination methodology and the same survey year – the differences between them are not measurement artefacts, but primarily reflect the different living conditions children grow up in.
The trend over time also calls for vigilance: Berlin had reduced the share of overweight school starters from 12.3 percent (2005) to 9.1 percent (2014/15) – a genuine prevention success. In the 2022 pandemic cohort, the figure rose to 11.4 percent, the highest level in more than a decade. The pandemic-related closure of childcare, leisure and sports facilities is considered the likely cause – and the affected school entry cohorts remain marked by it. For parents, this does not mean they are powerless: one of the simplest levers in family life starts with what goes in the glass.
Why drinking water matters so much for children
Of all the levers families can pull, the drink is the simplest – and one of the most effective. Sugar-sweetened beverages such as sodas, iced teas and fruit drinks deliver liquid calories that barely satisfy hunger: the body registers energy from drinks less effectively than from food, so those calories simply come on top. This is precisely why soft drinks rank among the best-documented drivers of childhood overweight in nutrition research.
The World Health Organization recommends limiting free sugars to under 10 percent of daily energy intake – ideally under 5 percent. A single glass of soda can already use up a large part of a child’s budget. Water, by contrast, delivers zero calories and zero sugar – and does exactly the same job: quenching thirst.
That the effect is real and measurable was shown, of all places, by a study from the Ruhr region: in a randomized trial at primary schools in Dortmund and Essen (Muckelbauer et al., Pediatrics 2009), water fountains combined with classroom lessons on drinking water reduced the participating children’s risk of overweight by around 31 percent.
The recommendation from nutrition societies is correspondingly clear: water should be children’s default drink – with every meal, at nursery, at school, on the go. According to the reference values of the German Nutrition Society (DGE), primary school children should take in around one litre of fluid per day through drinks. What matters most is not the exact amount but the habit: children who experience water as the normal choice reach for soda less often later in life, too. To see how LANGWATER supports families with this, visit drinklang.com.
Drinking & child health in numbers
“Children don’t simply grow out of being overweight”
Flora Kalo is a qualified nutrition and health expert with a degree in Health Promotion and specialist certifications including health-conscious nutrition, metabolic typing nutrition, rehabilitation therapy and sports coaching. In this interview, she puts the numbers into perspective for families.
“Unfortunately, that is not always the case. If a child consistently consumes more energy than their body uses, the excess will eventually lead to weight gain – just as it does in adults. What matters is this: a single BMI value says little on its own in childhood; it should always be evaluated using age- and sex-specific percentiles, alongside physical activity, eating habits and growth pattern. But if a child remains overweight over a prolonged period and this cannot be explained by muscle mass or an active lifestyle, it should not be dismissed as part of normal development. Early recognition and the right everyday support are essential.”
“Very strongly. Children who are overweight are far more likely to remain so as adults – particularly if the underlying habits stay unchanged. Childhood is the formative phase for taste preferences, eating behaviour and routines: what is served at home, whether meals are cooked from scratch, and which drinks are simply taken for granted. Genetics play a role, but they do not determine a child’s future – the greatest influence comes from the everyday patterns parents model.”
“That alone would be a significant step. The big problem with sugary drinks is that they deliver a lot of energy without creating genuine fullness – and they keep stimulating insulin production, making children feel hungry even when they don’t need food. Water cuts out those unnecessary calories. The benefits are not immediate, but over several years this one habit can make a measurable difference – to BMI, energy and concentration. And perhaps even more importantly: children learn that water is the normal choice. In the long run, that reduces the risk of obesity, type 2 diabetes and cardiovascular disease.”
“It is usually not one unhealthy food, but the sum of many small habits. The most underestimated factor is beverage choice – juices and cocoa drinks also add considerable extra calories that largely go unnoticed. Then there are gradually growing portion sizes, and phrases like ‘You can’t leave the table until you’ve finished everything’, which teach children to ignore their own fullness cues. Seemingly healthy snacks such as cereal bars or flavoured yoghurts add up as well. The goal is not to ban every less-than-perfect food, but to build family routines that support healthy development.”
“First: make water the default drink instead of sugary beverages – it is one of the simplest yet most effective changes of all. Second: build a healthy family lifestyle instead of putting children on diets – children don’t follow programmes, they copy what they see at home. Third: make daily movement a natural part of life. Parents don’t need to create perfection – they need to create an environment where the healthy choice becomes the easy and natural one.”
Where the data comes from
Transparency is part of this analysis: every figure in the ranking is tied to a publicly accessible source or a documented response from a public authority.
- Cities examined
- 21 major German cities for which current, robust figures on childhood overweight and/or obesity are available. For some major cities – including Munich – no comparable, publicly accessible current figures could be identified; they are therefore not part of the ranking.
- Data sources
- Official school entry examinations conducted by cities and federal states (including the North Rhine-Westphalia Centre for Health, Berlin’s health monitoring, the Saxony Statistical Office and municipal health reports), the AOK Children’s Health Atlas, and the Baden-Württemberg Health Atlas. For some cities, figures were requested directly from the local public health authorities.
- Time frame
- Survey years 2022 to 2025, using the most recent available figure for each city. The year is shown for each city in the table.
- Definitions
- Childhood overweight and obesity are determined using age- and sex-specific BMI reference percentiles (in Germany typically following Kromeyer-Hauschild: overweight from the 90th percentile, obesity from the 97th). In this ranking, “overweight” includes obesity.
- Comparability
- The surveys differ in age groups (mostly school starters, in some cases insured-population data or second-graders), survey years and study design. The ranking reflects the publicly available data and should be read as an orientation. Notable individual figures are flagged in the footnotes.
Drinking water – the cleanest form of prevention
In the end, all the numbers in this analysis lead to one simple insight: no other drink is as clean and as healthy as water. It delivers no calories, no sugar, no additives – only what a growing child’s body actually needs. While every soda is a decision in favour of surplus energy, every glass of water is a decision in favour of the body – the simplest form of preventive health care a family can choose.
The good news: access has never been easier. Tap water is among the most strictly regulated foodstuffs in Germany. Those who want to go one step further can treat it at home. Unlike simple jug filters, which mainly reduce limescale and the taste of chlorine, reverse osmosis systems such as those from LANGWATER go considerably further: their multi-stage filtration removes up to 99% of contaminants – including most microplastic particles, PFAS, hormones and metals. The water is then re-enriched with a precise, consistently dosed mineralization – for balanced, slightly alkaline water and an excellent taste that rivals your favourite mineral water, just without the plastic. So that the healthiest drink also becomes the one children love to drink. Because that is what it is all about: making water the norm, not the exception.
