My brother was watching me make our coffee and when I used two sugars he said I should refrain from sugar. Is he correct? He said something about acidity or something....?

DX 3-21-07 L tongue,SCC Stage IV (T3N2MO) TX Slash/Burn/Poison Method.
***Rapid Aggressive Recurrence 8-4-07 with same DX/TX. Life does not cease to be funny when people die any more than it ceases to be serious when people laugh. Never Give Up! ****UPDATE**** Our dear friend Petey passed away, RIP 9-2-07