Casey Means is perhaps best-known for writing the 2024 best-selling book “Good Energy,” alongside her brother Calley Means, who has been a close adviser to Health Secretary Robert F. Kennedy Jr. Since her nomination ro become US Surgeon General, Dr. Means has faced a torrent of criticism from across the political spectrum. She recently promised to resign her position and sell her stock in Levels, a company she co-founded that provides glucose monitors so that people can track their blood sugar levels, the kind of wearable technology that Mr. Kennedy has said he wants all Americans to use.