But since then WW shares have suffered heavy selling, dropping to a new 52-week low on Thursday.
The stock, due to its debt load and short interest, as well as the general anxiety about the impact of the new weight loss drugs, is subject to heightened volatility.
In the memo, Sistani told employees she wanted "to take a moment to address some of the breathless media coverage."
WW shares closed at $1.87 on Thursday.
It noted that WW was among companies from the weight loss industry involved in the TV event.
Persons:
Oprah Winfrey, Sistani, Eli Lilly, Sima Sistani, Guggenheim, Oprah, Winfrey
Organizations:
CNBC, Nordisk, Guggenheim Partners, Guggenheim, WeightWatchers Clinic, FDA, WeightWatchers, National Museum of, ABC