Why am I always tired? 22 medical reasons for feeling tired

You’re overdosing on sugar

Nutritionist Linda Foster says: “What many people don’t realise is that they can actually be made more tired by the very foods supposed to give them energy.“Sugary energy drinks and snack foods such as biscuits, chocolate and crisps cause sharp spikes then dips in blood sugar that can leave you flagging, irritable and desperate for a mid-afternoon nap.” Reboot your energy: Swap to low-sugar foods – and this includes avoiding white carbs such as bread and pasta which quickly convert to sugar in the body.