It's unclear how people get the disease — genetics plays a big role, though unknown environmental factors may also trigger the disease. Either way, the disease causes the immune system to mistakenly attack and kill insulin-producing cells, called beta cells, in the pancreas. (This differs from type 2 diabetes, in which the body initially makes sufficient insulin but the cells cannot properly use it.) Without enough insulin working to remove glucose from the blood stream, and allowing glucose to enter the body's cells, blood sugar levels spike. Left untreated, this insulin deficiency leads to a deadly complication called diabetic ketoacidosis. What's more, having high blood sugar over the long term can cause life-threatening complications such as kidney damage or heart disease, according to the Mayo Clinic.
In addition, as early as in 2008, the Swedish Board of Health and Welfare examined and approved advice on LCHF within the health care system. Advice on LCHF is, according to the Swedish Board of Health and Welfare’s review, in accordance with science and proven knowledge. In other words, certified healthcare professionals, who give such advice (for example myself) can feel completely confident.
How much the blood sugar level goes up after eating depends on the type of nutrients the food has. The three main types of nutrients found in foods are carbohydrates (carbs), proteins, and fats, which provide energy in the form of calories. Foods containing carbs cause blood sugar levels to go up the most. Foods that are mostly protein and/or fat don't affect blood sugar levels nearly as much.
You should have no more than three of these “feeding times” per day. The reason limiting the number and duration of your meal times is so important has to do with staying out of the vicious cycle of increasing insulin resistance. To get smart on insulin resistance — the cause of both type 2 diabetes and obesity — read Dr. Jason Fung’s book, The Obesity Code: Unlocking the Secrets of Weight Loss, or watch his free lecture on YouTube.