Thanks for searching, I hope parent would be able to provide further details on that statement.

I got O -ve so I maintained >45 Kgs weight(min required) so I could donate when needed but my bones couldn't take it (Osteoporosis, Achondroplasia) and so now I've reduced my weight to 40 Kgs; It was bummer to hear donating lowers risk of heart disease although I wish it was true as its a win-win for donating blood.