You are mostly water
About 60% of your body is water. Your brain is even wetter — around 73%. When you don't drink enough, your brain gets tired and grumpy before your body does.
Source: NHS Eatwell / U.S. Geological Survey water science
Real science, no lectures. Every card has a fact, a thing you can actually try today, and where the fact comes from — so you know it's true.
About 60% of your body is water. Your brain is even wetter — around 73%. When you don't drink enough, your brain gets tired and grumpy before your body does.
Source: NHS Eatwell / U.S. Geological Survey water science
One 500ml bottle of fizzy drink can hold around 13 teaspoons of sugar — but it doesn't make you feel full, so your body asks for food anyway.
Source: NHS Change4Life sugar guidance
Kids need about 60 minutes of moving each day — but it counts in bits. Walking the dog, dancing in your room and playing tag all add up.
Source: World Health Organization physical activity guidelines, 5-17 years
Filling half your plate with vegetables and fruit means you can still enjoy the rest — you just get more vitamins and fibre with it.
Source: NHS Eatwell Guide
When you sleep less than about 9 hours, your body makes more of the 'I'm hungry' hormone and less of the 'I'm full' one. Tired days really do feel hungrier.
Source: American Academy of Sleep Medicine, 6-12 years: 9-12 hours
Muscle burns energy even when you're sitting still. Building a bit of strength makes everything else — running, climbing, carrying — feel easier.
Source: WHO: muscle-strengthening activity 3 days per week for children
Boredom, sadness and stress can feel almost exactly like hunger. It's your brain looking for comfort, not your stomach looking for fuel.
Source: NHS mental wellbeing / emotional eating guidance
Cake isn't evil and broccoli isn't magic. It's how often and how much that shapes your health. Banning a food usually makes you want it more.
Source: British Nutrition Foundation, healthy eating for children
Between 9 and 14 most kids grow taller fast. Sometimes your weight arrives before your height does — and then you stretch out.
Source: NHS child growth and puberty guidance
Fibre from beans, oats, fruit and wholemeal bread takes longer to digest, so your tummy stays satisfied for hours instead of minutes.
Source: NHS: fibre in your diet
Your body can't tell the difference between a 'workout' and 20 minutes of dancing, scootering or a water fight. It all builds your heart.
Source: WHO physical activity guidelines for children and adolescents
Kids who speak kindly to themselves stick with new habits far longer than kids who tell themselves off after a slip.
Source: Research on self-compassion and habit persistence in young people
Eating in the morning helps you concentrate at school and makes big afternoon snack cravings less likely.
Source: NHS healthy breakfast guidance for children
Eating while watching a screen makes people eat more without noticing, because the brain isn't tracking the food.
Source: Studies on distracted eating and portion awareness
After only 4-6 weeks of regular activity your heart pumps more blood per beat, so stairs and running feel noticeably easier.
Source: Exercise physiology: cardiovascular adaptation in youth
People are much more likely to keep a habit when someone else knows about it or does it with them.
Source: Behavioural science: accountability and habit formation