Redcurrants is a Green food. Green foods are safe to eat as a regular part of a diet.
Guideline related quotes related to Fruits-Low-Fructose-Low-Glycemic and Green throughout Geoff Bond's publications.
Eat at least six pieces (servings) of fruit per day, focusing on “Green” and “Green-Amber” fruits. ~Paleo in a Nutshell p.102
Restrict total fruits consumption per session to three servings. ~Paleo in a Nutshell p.102
Specific references to Redcurrants throughout Geoff Bond's publications.
Fruits in our ancestral homeland were much less sugary and less watery than most of the fruits we have today. Flowever, most berries (raspberries, blueberries, redcurrants, strawberries, etc.) are low-glycemic; grapefruit, apples, bananas, and many other fruits are also okay. But we have to go easy on sweet, sugary fruits like pineapple, mango, and melons. ~Paleo in a Nutshell p.48
You should treat dried fruit (raisins, currants, dates, figs, apricots, peaches, etc.) as sugars. The drying process destroys some of the micronutrients, so in no way can dried fruit be a substitute for the fresh variety. In addition, we do not recommend that you liquidize fruits. Juicing, pasteurizing, concentrating, and reconstituting are processes that destroy the nature and utility of the natural fibers, strip out the nutrients, and increase the glycemic index. ~Paleo in a Nutshell p.66