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Anterior thermal images of the neck and upper thorax from four normal body weight males of the same family from three generations before and after placing one hand in cold water at 20°C. Seven-year-old (A and B) (on 25th BMI centile) and 13-year-old (C and D) (on 75th BMI centile) sons, 49-year-old father (E and F) (BMI 20 kg/m2), and 73-year-old grandfather (G and H) (BMI 24 kg/m2). Red pixels: 36.5–37.0°C; orange pixels: 36.0–36.5°C; yellow pixels: 35.5–36.0°C.
