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we adapted the plan, not buying the proprietary protein shake powder, just opting for musashi brand, and loads of fresh fruit and veg. I tended to have bacon and eggs nearly every day, which is lucky because bacon.
It wasn't a diet as such, more of a change of eating habits. We still stick to that sort of meal tapering (big breakfast, medium lunch and small dinner) and at least 1 hour activity/exercise a day
I did the keto diet about 12 years ago, lost 25kg in about 4 months and stayed sugar free for about 8 years.
I dabble a bit with good quality dark chocolate, and have the odd gingernut, but there's now sugar in the house, and no urges to. Fresh fruit and honey fill the void.