A rise in blood sugar after eating is completely normal — it means your body is doing what it’s supposed to do. Glucose from food enters the bloodstream, insulin is released, and that glucose gets delivered to your cells for energy. This rise-and-fall cycle is part of healthy metabolism.
You should worry more if your blood sugar never rises — that could mean you're not eating enough or your body isn't responding properly. It's not the spike itself that’s harmful, but consistently high spikes or poor insulin response over time. Balance is the goal, not flatlining your blood sugar.
People with type 2 diabetes are insulin sensitive - which means they have abnormally high insulin responses to foods containing glucose. The key strategy here is to manage glucose intake, by restricting total quantity at each meal or snack, and spreading the load more evenly through the day. Mixing their intake at each meal with healthy fats or protein help to slow down the absorption of the glucose.
People with type 1 diabetes do not produce insulin, which is why they have to inject (usually) insulin, and they have to count the carbohydrates they ingest, in order to ensure they use the right amount of insulin.
This does not mean either group should avoid any fruit (or any other glucose containing food), but they need to be sensible about their intake. The same goes for any individual with a health condition that needs to be managed nutritionally, whether that be diverticulitis, IBS, IBDs, kidney disease, etc.
The reason dietitians are the go-to people for nutrition advice? Because they have the depth and breadth of knowledge about food and human digestion, that no other medical professional has (including diabetic nurses)- let alone influencers or authors who have "researched" the topic They are also heavily regulated - here in the UK by the HCPC - and can't just make stuff up.
And so what if you don't like a certain food, or feel it upsets you? There are plenty of alternatives. You don't like fruit? Then eat more veg, and vice versa (variety is the key here). Protein comes in meat, fish, nuts, pulses/legumes, and dairy. Healthy fats can be found in virgin oils, nuts, seeds, avocados, and dairy.. And so on. Western nations tend to be very lucky in the sheer variety of wholefoods available.
If you are your healthiest self on keto, then more power to you. Ditto for low-carb, vegan, vegetarian, pescatarian, flexitarian, Mediterranean, Southeast Asian, Middle Eastern, African, Nordic, etc. At their core, all of these ways of eating tend to have similar principles.
The goal at the end of the day is to provide your body with a wide variety of essential nutrients, so that it can operate optimally. You get to pick and choose the foods the nutrients are packaged in.
And if you want a donut (I want chocolate icing on mine) then eat a donut. Just be aware that it is a treat, and not a nutritional essential, and you will be fine.