How Many Carbs Should I Eat a Day? What the Evidence Says
Updated: Oct 13
Written by Rosy Allan, BSc (Hons), ANutr
Registered Associate Nutritionist | Level 3 Personal Trainer | Level 4 Cancer Exercise Rehabilitation Specialist
Carbohydrates have been blamed for everything from weight gain to low energy, and low-carbohydrate diets remain a popular approach to weight management.
But are carbohydrates really something we should be restricting? How many should we eat each day? And does the amount change depending on whether we're trying to lose body fat, build muscle or improve our fitness?
The answer is more individual than many diet trends suggest.
Let's look at what carbohydrates actually do, what UK dietary guidelines recommend and what scientific research tells us about their role in health and body composition.
What are carbohydrates, and why do we need them?
Carbohydrates are one of the three main macronutrients, alongside protein and fat.
They provide energy for the body and are found in foods such as bread, rice, pasta, potatoes, fruit, vegetables, milk and legumes.
During digestion, many carbohydrates are broken down into glucose, which can be used immediately for energy or stored as glycogen, primarily in the muscles and liver. Carbohydrates are particularly important for supporting moderate- to high-intensity exercise because muscle glycogen provides a readily available fuel source.
Glucose is also important for normal brain function. However, the body can produce glucose from other substances when dietary carbohydrate intake is low. This means carbohydrate is not considered an essential nutrient in exactly the same way as certain amino acids or fatty acids.
Nevertheless, many carbohydrate-containing foods provide valuable fibre, vitamins, minerals and other compounds that contribute to a healthy diet.
The question, therefore, isn't simply whether we need carbohydrates, but which carbohydrate-rich foods we choose and how much is appropriate for our individual circumstances.
How many carbohydrates should you eat each day?
UK dietary recommendations provide a useful starting point.
The Scientific Advisory Committee on Nutrition (SACN) recommends that total carbohydrates contribute an average of at least 50% of dietary energy, excluding alcohol, at the population level (SACN, 2025).
However, this is a population recommendation, not a precise prescription for every individual.
Your carbohydrate requirements will depend on several factors, including:
Overall energy requirements
Physical activity and training intensity
Body composition goals
Food preferences
Medical conditions and medication
Individual tolerance and dietary needs
Someone with a physically demanding job who trains regularly may need considerably more carbohydrate than someone who is relatively sedentary. Rather than applying the same number of grams to everyone, carbohydrate intake should be considered within the context of the whole diet.
Does carbohydrate quality matter?
Absolutely.
Carbohydrate-containing foods differ considerably in their nutritional composition.
For example, oats, lentils, fruit and wholegrain bread can provide fibre and micronutrients alongside energy.
Sugary drinks and confectionery also provide carbohydrates but generally contribute much less fibre and fewer essential nutrients.
This distinction is important because dietary quality matters independently of carbohydrate quantity.
The British Dietetic Association recommends including nutritious carbohydrate sources such as wholegrains, fruit, vegetables and legumes as part of a balanced diet (BDA, 2026).
Don't forget about fibre
Fibre is a particularly important component of carbohydrate-rich foods.
It contributes to digestive health and can help support cholesterol management, blood glucose regulation and overall dietary quality.
Current UK recommendations advise an average fibre intake of approximately 30g per day for adults aged 16 and over (SACN, 2025).
Increasing wholegrains, beans, lentils, vegetables and fruit is a practical way to move towards this target.
What about sugar?
The UK recommends that free sugars contribute no more than 5% of dietary energy.
Free sugars include sugars added to foods and drinks, as well as those naturally present in honey, syrups and fruit juices.
They do not include the sugars naturally contained within intact fruit or plain milk.
This is one reason it's more helpful to consider where carbohydrates come from rather than classifying every carbohydrate-containing food as good or bad.
Do you need to cut carbohydrates to lose weight?
No.
Reducing carbohydrates is one possible dietary approach, but it isn't a requirement for fat loss.
When energy intake is consistently lower than energy expenditure, weight loss can occur through dietary patterns with different proportions of carbohydrate, protein and fat.
A 2022 Cochrane systematic review examined 61 randomised trials involving 6,925 participants.
Researchers found that low-carbohydrate and balanced-carbohydrate weight-reducing diets probably produced little to no difference in weight loss over periods of up to two years (Naude et al., 2022).
This doesn't mean low-carbohydrate diets cannot work. Some people find that reducing certain carbohydrate-rich foods helps them manage their overall food intake.
But the evidence doesn't support the idea that everyone must restrict carbohydrates to achieve successful weight loss.
For many people, retaining foods they enjoy, such as potatoes, rice, pasta and bread, makes their diet more realistic and sustainable.
The most appropriate dietary approach is one that supports nutritional adequacy, individual preferences and consistent progress over time.
What about carbohydrates when you're strength training?
Carbohydrates have an important role in supporting exercise performance.
When you train, especially at higher intensities, your muscles use stored glycogen to help meet their energy demands.
If training is frequent, prolonged or particularly demanding, adequate carbohydrate intake becomes increasingly important.
The British Dietetic Association recommends adjusting carbohydrate intake to match the demands of training. Someone undertaking moderate- or high-volume exercise may need more carbohydrate than someone following a general fitness routine (BDA, n.d.).
For people strength training a few times each week, a balanced diet containing appropriate carbohydrate sources may be sufficient.
For athletes or individuals undertaking multiple demanding sessions, more structured carbohydrate planning may be beneficial.
Protein remains important for muscle repair and adaptation, but carbohydrates can help provide the energy needed to train effectively.
When is the best time to eat carbohydrates?
There is no single carbohydrate timing strategy that everyone needs to follow.
However, timing can become useful when you're trying to support exercise performance and recovery.
Before exercise
A carbohydrate-containing meal or snack before training can help provide energy, particularly if you haven't eaten for several hours.
Depending on your preference and digestion, options might include porridge, a banana, toast or a meal containing rice or potatoes.
After exercise
Carbohydrates help replenish muscle glycogen following activity.
This is especially relevant when you have another demanding training session within a relatively short period.
If you train once per day or less frequently, your overall dietary intake is generally more important than rushing to eat carbohydrates immediately after every workout.
Are carbohydrates at night bad for you?
No. Eating carbohydrates in the evening does not automatically lead to weight gain.
Body weight is influenced by longer-term energy intake and expenditure, alongside other physiological and behavioural factors.
Meal timing can affect appetite, blood glucose responses and daily eating patterns, but there is no reason for most healthy adults to avoid rice, potatoes or pasta with their evening meal simply because it's late.
How can you include carbohydrates in a balanced diet?
You don't need to count every gram of carbohydrate to eat well.
A more practical approach is to consider how carbohydrate-rich foods contribute to your overall meals.
For example:
Breakfast: Porridge with milk, berries and seeds
Lunch: Chicken, rice and vegetables
Dinner: Salmon with potatoes and greens
Snacks: Fruit, wholegrain toast or yoghurt
These are examples rather than a prescribed meal plan.
The quantities can be adjusted to suit your energy requirements, appetite and goals.
And while wholegrain or higher-fibre options can offer nutritional advantages, white rice, regular pasta and white potatoes can still fit perfectly well within a balanced diet.
Food doesn't need to be unnecessarily complicated.
Final thoughts
Carbohydrates are an important part of many healthy diets, providing energy alongside valuable nutrients such as fibre, vitamins and minerals.
Current evidence does not support the idea that carbohydrates must be restricted for successful weight loss.
For someone aiming to improve body composition, maintain muscle or support training, the more useful questions are whether their overall diet meets their needs and whether their eating habits are sustainable.
Rather than asking how few carbohydrates you can get away with eating, consider how carbohydrates can support your health, training and everyday life.
At ROSY, we provide personalised online nutrition consultations and body composition coaching throughout the UK, helping clients make practical, evidence-based dietary choices.
Disclaimer: This article is for general educational purposes and does not replace personalised dietary or medical advice. People living with diabetes, other medical conditions or specific nutritional requirements may need individualised carbohydrate guidance from an appropriately qualified healthcare professional.
References
British Dietetic Association (BDA) (2026) Carbohydrates. Available at: https://www.bda.uk.com/resource/carbohydrates.html
British Dietetic Association (BDA) (n.d.) Sport and exercise nutrition. Available at: https://www.bda.uk.com/resource/sport-exercise-nutrition.html
Naude, C.E. et al. (2022) 'Low-carbohydrate versus balanced-carbohydrate diets for reducing weight and cardiovascular risk', Cochrane Database of Systematic Reviews, 2022(1), CD013334. Available at: https://doi.org/10.1002/14651858.CD013334.pub2
Scientific Advisory Committee on Nutrition (SACN) (2025) SACN statement on expressing energy, fat and carbohydrate intakes and recommendations. Available at: https://www.gov.uk/government/publications/sacn-statement-on-expressing-fat-and-carbohydrate-recommendations/sacn-statement-on-expressing-energy-fat-and-carbohydrate-intakes-and-recommendations
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