Dr. Loftus is a leading researcher in the field of memory psychology. In the first 3/4 of her Ted video, she mentions various studies/cases demonstrating how our memories are less solidified/reliable than we think, and that memories can easily be planted in 1/4-1/2 of the population.
Then, in somewhat of a bizarre turn at the end of the video (see the 15:00 minute mark), she goes on to discuss the ethics of planting memories and suggests it is good when it results in something beneficial, such as a reduction in obesity.
Always concerning when someone pioneering a research topic has this point of view. She seems to imply that this is the obvious decision we should make, to manipulate others’ memories when it is in their interest!