1. Unexplained fatigue

If you find yourself getting tired doing things that you could complete with ease before, that might be because of a cobalamin deficiency. What you need to do is start eating foods richer in vitamin B12.

These include liver, eggs, cumin seeds among other things.

2. Feeling light-headed and dizzy

This is also a trigger sign because vitamin B12 plays a large role in maintaining adequate blood pressure; when blood pressure falls, people feel light-headed and dizzy.

This is usually an accompaniment to other symptoms of serious diseases, so if it persists, you might want to get yourself looked at by a doctor.