My GP suggested I cut my carbs as I feel exhausted and fatigued all the time
I suppose I'd ask why your GP thinks a low carb diet would help this. I mean, there are a so many reasons why you might feel tired. I did find this which might explain it:
When you consume carbs, your blood sugar level is raised and you receive a burst of energy. Your body then releases insulin to lower your blood sugar, and this process is called reactive hypoglycemia. This is what causes you to feel tired after eating carbs, though is more of an issue with simple carbohydrates.
5 Reasons Why You Feel Extreme Fatigue After Eating Carbshttps://www.gym-pact.com › Nutrition