Hi Vinnymac - and welcome. The issue is not so much about whether the yeast is 'active' but whether what you are fermenting has all the nutrients and minerals the active yeast need to create the sterols they need to keep themselves healthy and to metabolyze the sugars. Grapes tend to have some the nutrients yeast need but most other fruit is significantly deficient and honey (for mead making) has just about none..
In my opinion you DO want to add nutrients each time you pitch the yeast.