The trick here is not only to avoid all obvious sources of carbohydrate (sweets, bread, spaghetti, rice, potatoes), but also to be careful with your protein intake. If you eat large amounts of meat, eggs and the like, the excess protein will be converted into glucose in your body. Large amounts of protein can also raise your insulin levels somewhat. This compromises optimal ketosis.
Once your muscle glycogen stores are full, they’ll remain this way for days, as long as no other strength training is performed (because muscle glycogen is burned only during high- intensity exercise). Carbing up on Wednesday also gives you time to make adjustments. If you feel you look flat and small on Thursday or Friday, increase your carbs a bit. Bloated and soft? Cut them back a bit. Make adjustments by 25–50 grams at a time.
Choose Liquid Calories Wisely. Sweetened drinks pile on the calories, but don't reduce hunger like solid foods do. Satisfy your thirst with water, sparkling water with citrus, skim or low-fat milk, or small portions of 100% fruit juice. Try a glass of nutritious and low-calorie vegetable juice to hold you over if you get hungry between meals. Be careful of alcohol calories, which add up quickly. If you tend to drink a glass or two of wine or a cocktail on most days, limiting alcohol to the weekends can be a huge calorie saver.