This is one of probably many tables showing the average heights and weights of males and females aged 18-25 in various countries. Click at the top of any column to sort it.
The heaviest are the males of the Cook Islands and American Samoa at over 103 kg (226 lbs.) - and an average American Samoan woman comes in at 98 kg (216 lbs.). US: 99.6 and 77 kg. UK: 86.7 and 72.7 kg.
At the other end of the spectrum are East Timor, Ethiopia, and Bangladesh - men in the 55 kg (121 lb) range, and women around 50 kg (110 lb). (for these countries - is it malnutrition, or simply their builds?)
The average woman from Dominica, Zimbabwe, Mauritania, or Botswana weighs more than the average man from these countries. The average male is always taller than the average female in every country listed.
As I would have expected, the Dutch are the tallest (1.84 m (6 ft 1/2 in) for men; 1.70 m (5 ft 7 in) for women). East Timor, Laos, and Yemen have the shortest at 1.6 m (5 ft 3 in) for men, and 1.53 m (just over 5 ft) for women). (US are 1.77 m and 1.63 m).