How to prevent ‘blood sugar spikes’ and have your levels return to normal faster:
eat less carbs/fewer refined carbs
reduce sugar intake
exercise
eat more fibre
drink water
maintain a moderate weight
these are all completely normal and achievable to manage your insulin levels on a day to day basis without anything specialist needed. However someone who is insulin resistant might need medication or a more specialist diet. They should speak to their doctor.
You obviously have a spike after consuming any food, that is how your body physically works and you can’t stop this happening, what the issue is if someone is diabetic or has a poor diet with excess sugar, their blood sugar levels does not come down to normal levels as easily/naturally as it would in a healthy person who eats a balanced diet.
We still all need some fats, sugars and carbs in our diets the issue is just eating too much of them - not eating healthy snacks.
You are likely to cause long term damage to your body by having consistently high or poorly managed blood sugars, being obese over a long period of time. the same for smoking or drinking too much.
However as OP is on a weight loss forum talking about healthy eating and changing snacks I imagine she is taking action to address this, as most people are - myself included. We all know this info, but you are pushing that all snacking is bad and that CICO ‘doesn’t work’ when it very much does for a lot of people. I assume you are pushing fasting (this is still restricting food) at the same time as denouncing eating in a calorie deficit during the day? How are they really different? Fasting is still most likely eating in a calorie deficit, people just count hours rather than the calories but if you eat in a small window, you will probably be eating the same food as me but I eat mine across the whole day.
How can I lose 4st never fasting at all and eating different meals at different times but in a calorie deficit but be told this doesn’t work? I find that fasting makes me feel disgusting and miserable so I do not want to do it. We each find our own ways to do things that work for us.
snacks = fine, depending on what the snack is. Even snack advocates told OP to eat more filling meals as well