Mrrzy, I guess that means finding a healthy balance.

I wonder what exactly it is about the keto diet which positively affects mental health. That would be interesting to find out because then you could work out a healthy solution, using the part of the diet which works but opening your options for a wider variety of healthy food. I'm also wondering whether, on reaching and maintaining ketosis for a specified period of time, is there a next stage of maintaining your mental health on a modified version of the keto diet? So many questions.

Thanks for the clarification, Doug. I don't see the Fast diet as a short term fix, because for me personally it helped me to find a more balanced long term way of eating a healthy diet and I monitor my weight so that if it looks like my healthy balance is going out of whack, I do a modified version of the Fast diet. But, I tend to go for lots of veges and legumes as well as meat and dairy so my everyday nutrition is generally balanced, even allowing for some hot chips or dark chocolate or other treats every now and then.

One tip I have seen on the diet programmes is to keep a food diary for about a week, being totally honest about exactly what I eat and how much. It can be revealing when I look at it all written down, instead of thinking I can have a bit of this and a bit of that and "it shouldn't make much difference". As for leftovers, I cook large-ish amounts and I freeze portions so that we can have a quick healthy meal if I don't feel like cooking sometimes. Also, I tend to eat on a smaller plate because it makes the portion appear to be larger. It's a psychological trick but it seems to work. And another trick I used when I came home from work, instead of raiding the frig or pantry for something sweet or fatty, I'd have a bit of protein, e.g. a bit of low fat cheese or a piece of leftover roast beef to tide me over until I had cooked dinner.