Adequate food records were available for analysis in a proportion of participants at each of the 4 timepoints (Table (Table2).2). Participants completed food records at a mean of 2.5 and a median of 3 timepoints. In general, comparing baseline to subsequent timepoints, mean carbohydrate intake decreased substantially and energy intake decreased moderately while protein and fat intake remained fairly constant.
If you can't see any ketones, be patient. It typically takes 2-3 days for your body to deplete glycogen stores, so don't expect to be in ketosis after just a day of low-carb. Remember, ketosis is a favourable condition and an indication that your body uses fat for fuel but you can lose weight even without being in ketosis. A diet high in fat, adequate in protein and low in carbohydrates is naturally sating, making you less hungry and, therefore, helps you lose weight.
^ Another publication of similar regimen was Hill LW, Eckman RS (1915). The Starvation Treatment of Diabetes with a series of graduated diets as used at the Massachusetts General Hospital. Boston: W.M. Leonard. This was so well received that it went into revised editions, eventually becomingThe Allen (Starvation) Treatment of Diabetes with a series of graduated diets (4th ed.). Boston. 1921. p. 140.
There are vegetables that are high in carbs and others low in carbs. The keto diet recommends sticking to the ones low on carbs but encourages you to eat a lot of them. Best vegetables are all green ones to make it easy. And vegetables that grow above the ground (e.g. lettuce) are always better than the ones that grow below the ground (e.g. potatoes)