Breakfast: Sweetened cereal and whole milk (281 calories, 15g sugar) and a can of fizzy drink (160 calories, 40g sugar). Hispanic households often have a breakfast taco with beans and cheese (296 calories, 13g fat).

Lunch: A hamburger with fries (884 calories, 48g fat), or pepperoni pizza with a side of macaroni cheese (1,170 calories, 10g sugar, 28g fat). Another can of fizz.

Dinner: Fried chicken (319 calories, 21g fat) with mashed potato or beef enchiladas (508 calories, 20g fat) with refried beans and Spanish rice with melted cheese (330 calories, 23g fat). More fizz.

Snacks: Mexican hard sweets (112 calories, 18g sugar), Cheetos (170 calories, 11g fat).

The super-supersize drink: An X-treme Gulp - a refillable plastic flask filled with a staggering 1.5 litres of fizzy drink (800 calories, 200g sugar).

Total

For an average day: 3,321 calories, 320g sugar, 106g fat (includes Gulp).

A 10-year-old boy needs 1,970 calories per day and a 10-year-old girl needs 1,740. The Texan diet is about 2,500 a day rising to over 3,000 if a Gulp is consumed. Anna Denny of the British Nutrition Foundation says: 'When they drink an X-treme Gulp, they consume 80 per cent more than they need, and a whopping 10 tablespoons of sugar.'