Carbohydrates are the body's preferred source of fuel. Carbohydrates you eat either need to be used immediately or stored as glycogen. Carbohydrates have received bad press over the years due to their association with fat gain. It's true that eating the wrong type of carbs, in the wrong amounts and at the wrong time of day, will cause fat gain. Whether the body uses or stores the carbs depends on your glycogen (stored carbohydrate) status and your activity level. When your blood sugar levels drop (hours without food, or 25 to 30 minutes into a workout), glycogen will be released for fuel. Only a finite amount of glycogen can be stored, so it's essential to spread your carbohydrates throughout the day rather than eating too much at one sitting. Eating more carbohydrate than your body needs at any point will inevitably lead to it being converted to fat, a process called de novo lipogenesis. Whether you eat carbohydrates before bed depends on your goal and body type (see your nutrient table).
Eating some complex carbohydrates when you wake will provide much needed energy to start the day, ensure glycogen stores are full for training and stop any muscle breakdown. How much, and how long before training, depends on your body type and goal (check your personal nutrition table).
After a workout your blood sugar and glycogen stores will be depleted; the longer and more intense the workout, the greater the depletion. Protein is also important at this time, but blood sugar and glycogen replenishment is the most important thing for your body. This is when simple, fast acting carbohydrates are required, as your body is sensitive to the refuelling and recovery effects of insulin. Check your nutrition table for the recommended post-workout carb and protein amounts.
It's essential to replenish your glycogen stores after training. The body stores the carbohydrates we eat as glycogen. Glycogen is a multi-branched polysaccharide of glucose (a single unit of carbohydrate). Our second long-term energy store, glycogen is made in the cells of the liver and muscles. It is this energy reserve that is converted back into glucose during the training session. The more intense the session, the more is used. Light or low intensity exercise and activities use the first long-term energy store, which is fat. (This doesn't mean you should be doing low intensity training to lose fat. Read the cardio section on your profile page for more information.)
Each molecule of glycogen is stored with three to four parts water. This stored glycogen is important in helping prevent muscle catabolism (breakdown). At YBP we don't advocate extreme low carbohydrate (ketogenic) diets. The carbohydrate amount we estimate is based on your body type, goal and daily activity levels. Low carbohydrate diets are less than 150g per day; an extremely low carbohydrate (ketogenic) diet is below 50g per day.
Low carbohydrate intake will lower thyroid hormone output as the body tries to slow metabolism in order to prevent starvation. It will also cause low insulin production, which in turn increases sodium loss through the kidneys. Coupled with high intensity interval training, this can leave you dehydrated and deficient in important electrolytes, causing bloating, light-headedness, headaches, fatigue and constipation. It's important to balance blood sugar and have a slow, controlled release of insulin, but like everything in the body, homeostasis is key: too much or too little is not advised. Too little carbohydrate will deplete glycogen, which will lead to fatigue, especially during high intensity workouts when you want plenty of energy. It will also lead to the breakdown of protein from muscle. Conversely, eating too much carbohydrate, of the wrong type and at the wrong time, will lead to too much insulin being produced by the pancreas and consequently fat gain. YBP have given you a base reference carbohydrate intake to start from. This may change depending on the information we receive from your monthly feedback form.
Keeping your blood sugar (glucose) balanced throughout the day is not only essential to prevent fat gain, it also prevents many other symptoms such as low energy, mood swings, depression, low immunity, inflammation, headaches, dizziness, the need for more than 8 hours' sleep, the need for tea or coffee to get going, frequent urination, heavy sweating, cravings for sweet foods, palpitations and feeling thirsty. Throughout the day blood glucose levels may fluctuate outside the body's desired range. Blood sugar levels rise after a meal, a stimulant or stress. If you are stressed, eat high glycaemic carbohydrates or drink too much caffeine, you will experience an initial rise in blood sugar followed by a crash to below the desired level. Insulin is the hormone responsible for keeping blood sugar within the normal range. It works by opening channels on cell membranes to let glucose move from the blood into the cells.
To help keep your blood sugar within a healthy range, avoid refined foods (white bread, white pasta, white rice), sugary foods (confectionery, sugary drinks), convenience foods (they often contain hidden sugars and can be high in saturated fats) and stimulants (tea, coffee, alcohol, chocolate). Instead, eat foods that balance blood sugar, such as whole grains: complex carbohydrates that release sugars slowly into the blood to provide sustained energy. These include brown rice, quinoa, buckwheat, sweet potato, wholegrain pasta and wholegrain bread. Oats are particularly good, making them an excellent choice, especially for breakfast.
Aim for seven portions of fresh fruit and vegetables per day, ideally two pieces of fruit and five portions of vegetables (a single portion is around 80g). Fresh fruits and vegetables are a good source of fibre and contain essential vitamins and minerals needed for blood sugar balance and general health. Try to include a wide variety of colours, including dark green leafy vegetables such as broccoli, spinach and kale.
Essential fats, found in oily fish, nuts, seeds and their oils, improve insulin's ability to transport glucose out of the blood into cells. Although we do not advocate low carbohydrate diets at YBP, certain body types who tend to be intolerant to large amounts of carbohydrate will need to eat less than other body types, but still not an extremely low carb diet. The more sedentary a person is, the less carbohydrate they need. All these factors are taken into consideration from the information gathered on your YBP questionnaire, to give you the most accurate carbohydrate estimate possible.
You should include a protein source at each meal and snack, ideally one that does not contain high levels of saturated fat (see the food chart for more information). Protein slows digestion, which creates a slower release of sugar into the bloodstream and a gradual, even release of insulin. Fibre found in fruit, vegetables, whole grains, beans and lentils also helps slow the absorption of sugars into the bloodstream.
Drink plenty of water (mineral or filtered if possible), herbal or fruit teas and diluted fruit juices. Eating little and often helps your body keep blood sugar balanced, so include snacks in your diet.