Falta de ferro?
https://www.thesun.co.uk/living/2789916/heres-what-is-really-behind-the-tiredness-epidemic-sweeping-the-uk-and-how-you-can-beat-it/
"The reason for this could be down to iron deficiency, which is one of the most common causes of unexplained tiredness.
Iron is important because it helps your red blood cells carry oxygen around the body – and without enough oxygen, your organs and tissue just can’t work effectively."
(...)
"“People are eating 13% less red meat than they used to, which contains the most easy-to-absorb form of iron.”
Thankfully, there are a few ways you can easily up your iron intake, with Vitamin C capable of improving iron absorption by up to 180%.
This means that a glass of orange juice with your meal could help your body access as much iron as possible."
(...)
"Conversely, some foods – such as milk, tea, beans and chilli – hinder iron absorption, so should be limited.
Iron supplements can offer a way to deal with a deficiency, but many women complain of unpleasant side-effects after taking them."
