Hi TWSAndy
You may just surprise yourself at how easy this becomes after just a few days.
There may be one or two initial side effects such as headaches and light headedness but they vanish within a few days.
The big secrets are to keep the carbs under 50gr / day, eat full fat products, and drink at least 2 to 3 ltr of non sugary fluids / day
If you see your calorie count dropping, add exta fat to your daily intake. It’s hard to get your head around at first but it really does help.
Best of luck to you and your wife and keep us informed of your progress.