Holly Willoughby has confessed she gets "frustrated" talking about diets during a discussion on Adele's recent weight loss on This Morning.The 39 year old, who has remained tight-lipped about her own secrets to keeping in shape, spoke out about the 32 year old singer's transformation one day after she had posted a stunning photo of herself for her birthday.Talking to Vanessa Feltz, who recently scolded presenter Eamonn Holmes for having a "tantrum", over a zoom video call, Holly said: "Vanessa, to be fair, I get very frustrated when we're talking about diets. "I know you've been on here talking about your own battle with weight loss and you tried every diet in the book and none of those worked for you.