Dr Bernstein suggested many years ago that they do (Chinese Restaurant Effect). The increase in blood sugar is proportional to the amount of stomach 'stretching' caused by larger portions. Larger volumes of anything, even sawdust, water and keto-diet meals would result in increased blood sugar values. Hmmm... would never have guessed that. https://www.diabetesforum.com/diabetes/27657-chinese-restaurant-effect.html https://kickincarbclutter.blogspot.com/2007/09/chinese-restaurant-effect.html I have tried to ketodiet for about a year, but have dropped out of ketosis about four times suffering keto-flu for 4-10 days. When in ketosis I felt much better, so I really want to continue and reduce number of drop outs or at least make the recovery time shorter. I have observed higher carb readings at 6pm dinner for large volumes of beef and boiled chicken each with no sauce. These meats contain 0 carbs/100g according to the food labels. Had the meals with 100g celeriac mash and 50g cooked broccoli (about 5g carbs) and measured the following blood sugars after 2 hours on several occasions. Beef 140g + vegs -> 6.4mmol/L Beef 220g + vegs -> 7.5 mmol/L Boiled chicken 140g + vegs -> 6.6mmol/L Boiled chicken 220g + vegs -> 7.7mmol/L show that larger meat volumes result in higher blood sugar values. I think I dropped out of ketosis at least once after a large portion of chicken, but do not recall if I did for beef. Have you been affected by or noticed the Chinese Restuarant Effect too?