Not for the usual medical reason where you are advised against grapefruit juice for its potentiating tendencies when combined with certain drugs. My doctor has ordered me away from my pink grapefruit Citron in progress:
In fact, any knitting does not mix with the current state of my thumb. How is it one little appendage can cause so much misery? And the ugly names to go with it - Trigger Thumb, French Washer Woman's Syndrome, de Quervain's Tenosynovitis. Not whining, but needing a portable activity for C's big birthday trip coming up. No thumb action allowed. Suggestions appreciated, good books, adaptive knitting.....?