There is no definitive answer to this question as it is impossible to know the weight of every person alive in 2019. However, we can make some educated guesses based on available data.
According to the World Health Organization, the average weight of an adult human male is around 13kg (28lbs) heavier than the average weight of an adult human female. This means that, on average, men are heavier than women. Therefore, it stands to reason that the heaviest person alive in 2019 is likely a man.
The Guinness World Records lists Robert Wadlow as the tallest man ever recorded. He was born in 1918 and died at just 22 years old in 1940. At his peak height, he was 2.72m (8’11”) tall and weighed an incredible 222kg (489lbs). Based on these records, Wadlow would have been the heaviest person alive in 2019 if he were still alive today – almost 70 years after his death!
Of course, there may be people alive today who weigh more than Robert Wadlow did at his peak height and weight. However, without any definitive way of knowing who they are or how much they weigh, we cannot say for sure who the heaviest person alive in 2019 really is.