Frankly yesterday I felt so full and fatty that I was about to throw the towel but I am holding on. Butter is kind of OK, even compared to lovely extra virgin olive oil I usually consume. The key factor is sheer quantities; I usually cook and consume each day about half of the fat I am being asked to consume as part of this experiment. Not even on a cheat day I would use 50g of butter on my own initiative.
Despite mild negative feelings and a natural discomfort in feeling fat accumulating around my belly I will carry on; I am very curious to see the final results for myself and the experiment as a whole.