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Sugar and refined carbohydrates are considered ’empty calories’, mainly because they don’t contain any useful nutrients. Some foods high in sugar are heavily processed, and the sweet stuff is added to make them more palatable and desirable. It’s these foods that are not always easy to spot the sugar in, and often those that are marketed as ‘healthy’, or low in fat which can be the worst offenders. In some cases, ready meals could contain up to 12 teaspoons of sugar per portion, a can of cola houses six and a bowl of dry Bran Flakes has three.

To help ascertain if you’re eating too much sugar, leading nutritional therapist, Natalie Lamb from high-fibre supplement Lepicol Lighter told us the tell-tale signs to watch out for.

1. Premature ageing

Excessive sugar consumption can cause long-term damage to skin proteins, collagen and elastin, leading to premature wrinkles and ageing. Too much sugar could also contribute to an imbalance of the female menstrual hormones which could result in acne along the jaw line. Sugar is also the favourite food of less desirable gut bacteria and yeast, and consuming too much could lead to an imbalanced gut flora and inflammation in the body, typically seen in skin conditions such as eczema.

2. Constant cravings

Sugary foods are addictive, giving us a quick ‘fix’ that tempts us back time and time again. Foods high in sugar have been shown to activate the reward pathway in the brain by releasing dopamine, similar to that of addictive drugs. The nutrient chromium could help to restore normal insulin function and supplementation has been shown to contribute to the maintenance of normal blood glucose levels and to reduce sugar and carbohydrate cravings. I recommend Lepicol Lighter (£17.99), a new supplement which contains 7 strains of live bacteria, chromium, glucomannan and psyllium husk fibres which increase satiety and support healthy bowel movements.

3. Low energy

Glucose is essential for energy production throughout the body, however, it is important to keep blood sugar levels balanced as opposed to experiencing the peaks and troughs that occur when we binge on sugary snacks. Following the consumption of sugar, the pancreas releases insulin to help transfer glucose to the cells, meaning we may experience a rush of energy. Once used up, we can experience a dip in energy as the body demands more sugar to start the cycle all over again. It is not hard to imagine that the higher the sugar peak, the more extreme the sugar dip that will follow.

4. Unexplained bloating

Less desirable bacteria and yeast produce gases when they ferment our undigested food in the colon. Bad bacteria particularly love eating sugars, whereas beneficial bifidobacteria, who love veggies, are not believed to produce any gas. An overproduction of gas can lead to pain after eating, uncomfortable bloating and flatulence.

Jonas Bresnan for Harper’s Bazaar, 2010

5. Weakened immune system

Did you know that 70% of our immune system is located in the gut, and supported by beneficial gut bacteria? It’s therefore important to keep a balance of good bacteria. A diet high in sugar, however, will feed the less desirable bacteria and yeast and consequently affect how well the immune system functions.

6. Insomnia

Eating sugary foods late at night could lead to a rush in energy at a time when we should be focusing on slowing down and preparing the body to rest. Our ‘happy hormone’, serotonin is largely produced in the gut and is essential for melatonin production – the ‘relaxation’ hormone – necessary to aid a good night’s sleep. If you’re someone who has trouble sleeping, then it might help to reduce the sugar in your diet, and be kinder to your gut.

7. Weight gain

Glucose is a major source of energy for the body, but if it is not used immediately as energy, the body stores excess in the liver, muscles, or as fat around the middle. Glucose storage worked well when we were hunter-gatherers, but nowadays food shortage is rarely a problem so we end up storing more glucose as fat around the middle.