Someone with a BMI of below 18.5 is considered
underweight. Whilst some people are naturally slim,
being underweight from poor nutrition, or as a result
of other disease, can have serious health risks.
Illness associated with being underweight ranges from
simple tiredness due to inadequate energy intake,
through to reduced immunity to infections, anaemia,
vitamin deficiencies, thinning of the bones,
infertility and heart rhythm irregularities. If your
BMI is under 18.5 you should discuss it with your
doctor. They will want to make sure you don't have any
illness causing the weight loss and then will advise
you about how to safely gain weight.
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