This interesting research was published recently:
https://www.science.org/content/article/britain-s-postwar-sugar-craze-confirms-harms-sweet-diets-early-life
In short, children whose first 1000 days (starting from conception) were during the rationing of sugar in the UK ended up with a 40% lower risk of developing type 2 diabetes and a 20% lower risk of hypertension later in life. These are conditions which can cause stokes, heart attacks, and problems with eyes, kidneys and feet.
So for pregnant mums out there and parents with small children it may well be worth abstaining from sugar for those first crucial 1000 days.