We’ve written before at HuffPost UK about how cool weather can lead to itchy skin, especially at night.Most of us know that the colder months can cause some of us to feel down, unfocused, and unmotivated too ― also known as seasonal affective disorder (SAD). However, a deficiency in a certain vitamin can have effects on your body that may be confused for SAD. Vitamin B12 deficiency (and folate anaemia, which is closely linked) affects about 6% of under-60s, and 20% of those over the age of 60, in the UK. It can affect your body, mind, and mood. What are the symptoms of B12 deficiency?Per the NHS, vitamin B12 deficiency and folate deficiency anaemia both cause a range of symptoms.“These usually develop