Carbohydrates have had a history of being demonized, but what are they? This blog is going to cover what they are, and why they shouldn’t be feared.
Carbohydrates are a macronutrient, which means that we eat them in fairly large amounts in our diet (protein and fats are also macronutrients). These macronutrients are involved in energy, growth and repair, and maintenance of the body.
Carbohydrates when eaten are broken down in the body into glucose. Glucose is our main source of energy to keep us functioning, and is used by our muscles, and our major organs. Glucose is even your brain’s preferred and primary energy source! If we do not get enough carbohydrates in our diet, our body will convert fatty acids into a form of energy which can be called upon (known as ketones) to meet the needs of energy requirement for our brain, or certain amino acids (dietary proteins) will be used. For every 1 gram of carbohydrates consumed it provides 4 calories.
Carbohydrates can be separated into the following categories:
- Simple (Free Sugars) - foods that come into this category are any which have any sugars added to food, such as cookies, chocolate cakes, jelly (with added sugar) and candy. However, this also includes sugars which are naturally occurring, such as honey, fruit and vegetable juices, purees and syrups
- Complex (Starchy Carbohydrates) - pastas, rice, bread, potatoes, lentils, oats, and pulses
Note: Some carbohydrates which are deemed complex or starchy, can be refined or processed, (for example, white pasta or bread), whereas others can be less refined, (such as wholegrain pasta, or wholegrain bread).
Simple free sugars are broken down faster than complex carbohydrates, which are broken down slowly.
Starchy carbohydrates, fruits and vegetables will provide you with energy, as well as vitamins and minerals. They also provide you with fiber, which I’ll discuss the importance of further down.
Will carbohydrates make me fat?
If you were eating an excess amount, then yes. However, it is not specifically carbohydrates which do this. All food contains energy, so excess amounts of energy, in relation to energy expenditure will lead to weight gain. The amount of carbohydrates needed per person varies, however, as a general guide a portion is roughly the size of your fist, but this will depend on your needs and your lifestyle.
Why do people lose weight quickly after cutting out carbohydrates?
We are able to store some carbohydrates in our muscles, and our liver. These carbohydrates are stored as glycogen, and any glycogen in the muscles remains here to only fuel the muscle itself (i.e. it isn’t used to fuel other tissues and organs). However, to be stored it needs water. For every 1 gram of glycogen stored, we need at least 3 grams of water. So, in the case where people cut out carbohydrates, they deplete their glycogen stores (as glucose is the preferred energy source), and also lose the water that was stored with the glycogen, which means that fluid is lost and therefore weight! Essentially, it is water weight you are losing and not fat with the initial weight loss seen. You do not need to completely cut out carbohydrates to lose weight.
Carbohydrates also play a role in transporting tryptophan to the brain, which plays an important role in making serotonin, our happy hormone!
What is glycaemic index?
Something that people have often heard of is glycemic index (GI). Carbohydrates are broken down and absorbed at different rates. What GI looks at is which carbohydrates are broken down into glucose quickly (high GI), and which ones are more slowly broken down (low GI). It is useful to know about GI if you need to measure your blood glucose levels, however, a low GI doesn’t always mean something is healthier… a banana has a higher GI, than Nutella due to the fat content slowing the release of sugar from the Nutella.
So, fiber came up earlier, but why is it important? It’s recommended in the US to aim to get 25-30g of fibre per day, but for most of us we do not achieve this, and the average intake for adults is around 15g per day.
Fibre can be found in bread, beans, lentils, fruits and vegetables. We cannot break down fiber and absorb it for energy, and instead it helps to keep our digestive system healthy, by promoting good gut health.
Low fiber intakes are associated with an increase in constipation, diverticulitis, and even risk of bowel cancer. By having a high fiber diet, it can help to reduce cholesterol, reduce the risk of diabetes, as well as helping you to maintain a healthy bowel movement and a healthy gut microbiome by feeding your gut bacteria.
Fiber comes from plant foods which cannot be broken down by our digestive enzymes, however, when it reaches the large intestine it is fermented by our gut bacteria, producing short-chain fatty acids and gas. Fermentable fiber includes fruits, vegetables, nuts and oats. Other fiber which is not fermented adds bulk and helps to reduce transit time, in turn reducing constipation, and includes cereal grains, wheat, rye, barley, and oats.
If you currently consume a small amount of fiber and want to increase it, you should do this slowly to try and reduce the risk of abdominal distention (bloating), and discomfort, and also make sure that you are drinking enough water.
Some food choices for you which are god sources of fiber are porridge, sweet potatoes, potatoes with skin on, wholemeal and wholegrain pastas and breads, beans and pulses, vegetable and fruits (not juiced, or pureed), seeds and nuts. On food labelling anything with more than 6g of fiber per 100g is classified as high in fiber.
Quality and Quantity
When looking at your carbohydrates it’s important to consider quality and quantity. Try and aim to have a higher intake of your complex/starchy carbohydrates while trying to ensure that you choose the less processed, wholegrain option. However, if you have white rice or pasta from time to time, this is completely fine! Try and go for fruits and vegetables in their whole form instead of having them as juices, as this removes the fiber and increases the rate that the natural sugars are absorbed.
Fruit and Vegetables
It's important to try and get a variety of fruits and vegetables in your diet. Fruits are vegetables are a great source of vitamins and minerals that they contain, as well as antioxidants, phytonutrients and fiber.
You don’t need to ban or cut out carbohydrates from your diet, they play a role in providing us with energy, fiber, and vitamins and minerals. It’s important to remember to look at the quantity and quality of the carbohydrates you consume, but also enjoy when you have things that aren’t wholegrains or high in fiber from time to time!
If you have a medical condition which impacts the metabolism and utilization of carbohydrates like Type 1 Diabetes, or Type 2 Diabetes, please follow the advice given by your doctor, or health care professional.
Daisy, MSc PGDip ANutr,
Is a Registered Associate Nutritionist with a Master's Degree in Public Health Nutrition, and a Post Graduate Diploma in Eating Disorders and Clinical Nutrition, both of which are Association for Nutrition (AFN) accredited. She, also, has a BSc degree in Psychology and Cognitive Neuroscience; and has completed an AFN accredited Diet Specialist Nutrition course. Daisy has worked for an NHS funded project, the Diabetes Prevention Programme; and shadowed a nutritionist in Harley Street, London
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