Since she finds a strong shorter-telomere association in neither equally sweet juices NOR in diet soda, this result probably just unhealthy-lifestyle-correlation (e.g. drug addicts and undiagnosed diabetics drink more soda). Also, “The extremely high dose of sugar that we can put into our body within seconds by drinking sugared beverages is uniquely toxic to metabolism” (from her Time interview) seems an overreach. A properly functioning metabolism can handle some sugar, even in a spike.