hi OP
sorry to be dense, but how does it relate to your arthritis - will it be more painful on a fast day?
I am not hugely convinced that you will get benefits of fasting if you effectively drip feed yourself.
I don't "do" recipes on a fast day. I guess if I was splitting calories I'd have a bit of yogurt, maybe oatcake with hummus and then a tomato juice or some broth based soup?
I found this para on 5:2 and diabetes
*Type 2 diabetes and the 5:2 fast diet
The fact that intermittent fasting shows evidence of improving insulin sensitivity may be an attractive option for people with a BMI over 25, borderline diabetes (prediabetes) or with type 2 diabetes but not on blood sugar-lowering medications.
The diet may be good for people who can handle single days of significantly restricted calorie intake in preference to modest calorie restriction every day.
On fasting days, the body will be forced to use stored energy from the body, fat and stored sugar (glycogen), which can help with weight loss and may improve blood glucose and cholesterol levels.
If you are on insulin, or hypo causing medication, such as sulphonylureas or glinides, an intermittent fasting could significantly increase the risk of hypos. Your doctor should advise you on whether the diet is appropriate.*
this came from the page
www.diabetes.co.uk/diet/5-2-intermittent-fast-diet.html
Would it make sense for you to diet a different way, e.g. low GI/GL?