Briss, I think it is good that you turned the trip down, if he had offered for you to take you other half and get pampered then it may have been worth it!
On BBC 2 Scotland there is a program on -> What's the right diet for you? not sure if you can get it on iplayer, I have only just switched through the channels, think they are asking different groups to try different diets, including the 5:2 diet or intermittent fasting diet as they are calling it. May be worth looking at.
https://www.bbc.co.uk/programmes/articles/28kV5mpZvcDtJ2hyDbZ5h1p/what-s-the-right-diet-for-you