As they say: Hindsight is 20:20 vision (or 6:6 vision in UK). Regret is an understandable emotion but in itself is negative unless balanced with something less draining. Certainly 'Sue' has gone on to make other lifestyle changes and that perhaps is the positive along with adopting the low carb diet.
I am not qualified to put a hex on the Eatwell plate and similar diets but wish such dietary notions would fade into the background along with the Big Food lobbyists that are at least partly responsible for them.
Give them a prolonged dose of Aussie sun, i say, to be sure of wrinkling and fading them !!