Hi franbern
There's loads of info out there.
Books-try the Michael Moseley fast 800 series. Maybe fasting is not for you but the principles of low carb are spelt out and there are loads of recipes. There is a purely recipe book of his that is useful. There are many other low carb books on the market and thousands of articles online. Try Pinterest-its a gold mine of low carb recipes.
YouTube-again there are loads of you tube videos available, showing both recipes and explaining the principles.
I try hard to follow a low carb diet as I am concerned about avoiding diabetes and I have some concerns about the possible link between sugar(carbs) and dementia.( I know there's more to dementia than that but there is a tenuous link). I try to limit my carb intake to under 50 grams a day. Some days I go over but I try hard to stay in that limit.
I avoid substitutes really. Ive tried the low carb breads, rice, pasta etc. they are very expensive and just remind me of the real thing, but not quite. So I don't bother.
I also avoid low fat products. Things such as low fat yogurts. Often the fat is replaced with sugar.
I avoid other low cal products as well. Well, keep them to the minimum. I will have a daily diet coke.
I also avoid cereals as even non sweet cereals can concert to sugar in the body.
So what's in is fresh meat, fish, nuts,eggs, cheese, cream,vegetables that are low in starch. These generally grow above the ground. I eat berries for my fruit intake. My all time favourite breakfast is Greek yogurt with blueberries and toasted crushed nuts. Yummy.
It takes some time to get to grips with but I feel much better eating in this way. It depends on why your GP has suggested low carb. Its good for weight loss but equally good at reducing blood sugars if diabetes is a threat.
Having said all that, I try not to impose my diet on other people. So if there is an invitation for a meal (ha, if only we could) if I'm served carbs, I just go along with it for that occasion. If I can serve myself, I avoid the carbs. I also found that going low carb has broken the link for me between regarding cakes,chocolate etc. as a treat. I no longer crave those items. In the past, if I had a biscuit or cake, it made me want more. Bonus for me.
An overview of this diet is that its full of proteins and vegetables. Almost no processed food. It has opened up a whole new way of eating that makes me feel less sluggish and less aches and pains. Its certainly made me more aware of what I am eating. It has also changed the meals I eat, in a good way. And I do eat mayonnaise!
Give it a go. You might enjoy it