A medical professional has issued a warning that a "common" deficiency could be the cause of your low mood. The expert suggests this issue affects over one billion people globally.

As winter approaches, many people notice a shift in their mood. The chilly weather and early nights can often leave us feeling somewhat gloomy. In some instances, this could be due to what's known as seasonal affective disorder (SAD). However, there might be another explanation.

In a video shared on the social media platform TikTok, Doctor Sermed Mezher highlighted the issue of iron deficiency. Iron is an essential mineral for the human body, crucial for transporting oxygen in the blood and for various metabolic processes.

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Dr Mezher said: "Low iron is the most common nutritional deficiency in the world, affecting more than one billion people." He elaborated on how it can influence dopamine, often referred to as the "feel-good" hormone.

He added: "And its effects on dopamine go way deeper than just oxygen transport. So dopamine is made from an amino acid called tyrosine over a couple of steps, and the enzyme that does the first step needs iron to be able to function.

"It's no surprise, then, that in iron deficiency, it's been shown that there's dysfunction in pathways related to dopamine that control things like feeling happy, reward, self control and social behaviour."

Fortunately, this issue can be addressed. Dr Mezher explained: "The good news, though, is that when your iron stores are replenished, then these pathways return to normal function and some ways you can help to do that faster are taking iron with vitamin C and avoiding caffeinated drinks two hours before and after."

The NHS states that iron deficiency anaemia symptoms may include:

• Fatigue and energy depletion


• Breathlessness


• Notable heart palpitations


• Unusually pale complexion


• Headaches

Should you suspect you're suffering from iron deficiency, it's advisable to consult your GP. They can conduct blood tests for confirmation.

Dietary changes can help raise your iron levels. Iron-rich foods include:

• Dark leafy greens such as watercress and curly kale


• Iron-fortified cereals and bread


• Meat products


• Dried fruits including apricots, prunes and raisins


• Legumes (beans, peas and lentils)

It's also advised to reduce consumption of:.=

• Tea


• Coffee


• Milk and dairy products


• High phytic acid foods, such as wholegrain cereals, which can inhibit iron absorption from other foods and supplements

The NHS cautions: "Large amounts of these foods and drinks make it harder for your body to absorb iron. You might be referred to a specialist dietitian if you're finding it hard to include iron in your diet."

Your iron needs are:

• 8.7mg a day for men aged 19 and over


• 14.8mg a day for women aged 19 to 49


• 8.7mg a day for women aged 50 and over

The NHS further advises: "Taking 17mg or less a day of iron supplements is unlikely to cause any harm. But continue taking a higher dose if advised to by a GP."