Do you have a credible source on that? According to the same book:

> The safety of aspartame (a commonly vilified sweetener) is asserted by the independent medical governing bodies of more than 90 countries. It has almost unanimous approval for safety by the top medical and drug safety councils in the world. The FDA has pronounced that aspartame is “one of the most thoroughly tested and studied food additives the agency has ever approved.” The story is much the same for all other major artificial sweeteners, including sucralose, acesulfame potassium, and saccharin. A large amount of calorie-free sweetener can be consumed before an even mild health risk.