Twenty-three-year-old Saskia Reeves-Priestley was at work when she suddenly collapsed.
"I just felt really dizzy, really nauseous, was having heart palpitations and was really hot," she says.
Saskia, a special educational needs teacher, was a keen goalkeeper who played football four times a week and felt fit and healthy. While her symptoms are not directly linked to vitamin D deficiency - she realised something was wrong.
Blood tests later showed her level was so low - it was "next to nothing".
In the UK, low vitamin D rates are increasing in some age groups , external - particularly in girls and young women.
According to data from the National Diet and Nutrition Survey, last year nearly a quarter of 11- to 18-year-olds were classed as deficient.
Vitamin D can come from our diet, in foods such as oily fish and meat, or supplements.
But most is made by our body when UV light in sunlight hits the skin. Lower levels of sunlight - depending on where in the world you live or the time of year - decrease the body's ability to produce it.
Covering parts of the body and wearing sunscreen also has an impact - despite their protective advantages.
Those with darker skin need exposure to stronger light to produce the same amount of vitamin D as lighter skin.
Doctors don't routinely offer blood tests to check for vitamin D deficiency, but will offer a supplement if a patient is concerned they might be high risk.
Vitamin D deficiency is linked to the bone disease rickets in babies and infants. In adults it causes a similar weakening of the bone called osteomalacia , external .
"They call it the silent disease," says Dr Suma Uday, a paediatric endocrinologist who wants to raise awareness of the problem.
She warns that vitamin D deficiency in young people and adults is difficult to spot and can be missed or misdiagnosed. Symptoms include fatigue and joint and bone pain.
Uday ka sɛ: "Ɛbasiti di nnompe no dinn ma ɛma no yɛ mmrɛw na ɛma no yɛ den sɛ ɛbɛbubu."
Amaka Osu se ɔnnye nni sɛ ne nnamfonom pii nim yareɛ no nsɛnkyerɛnne a ɛwɔ hɔ.
Amaka was in the middle of making dinner at her university house in Liverpool when she started shaking.
"Na mintumi nhunu m'anim ankasa," ɔka. Ne fiefo no de no kɔɔ A&E - akyiri yi ɔno nso wobehu sɛ vitamin D a ɔde no sua wɔ ne ho.
Sɛ ɔbrɛ no akyi no, ɔka sɛ na onni sɛnkyerɛnne biara: "Meyɛ sukuuni a madi mfe 21. Mewɔ adwuma ne sukuu - bere nyinaa na mabrɛ."
Ɔkae sɛ ne maame huu amane esiane vitamin D a na ɛsua nti nanso ɔka sɛ wanhunu sɛ ebetumi aba ne so.
After taking supplements, Amaka feels a lot better, but she is anxious in case it happens again. "It was scary and I don't want to experience that again."
Uday joins other clinicians and academics who have formed a group - ACT NOW Vitamin D - calling for the threshold at which you are classified as deficient to be raised.
Ɔka sɛ saa bɛ "kyere" nnipa pii a wɔwɔ vitamin D kakra na ama yɛahu sɛnea asɛm no atrɛw kɔ akyirikyiri. Ɛbɛkyerɛ nso sɛ wobetumi ayɛ deɛ ɛmeɛɛ no ho aduru ntɛm, sei na ɔka.
Uday bɔ kɔkɔ wɔ "nkwa nyinaa mu hia bi" a ɛwɔ mmaa mu ho - wɔ mmabunu bere mu, afei nyinsɛn bere, na afei abofra a wɔawo no foforo no nya ho haw.
"Sɛ woanteɛteɛ no wɔ ahyɛaseɛ ankasa a," ɔka sɛ, "yei bɛka awoɔ ntoatoasoɔ pii."
Saskia Reeves-Priestley bɔ bɔɔlo mprɛnsan wɔ nnawɔtwe biara mu - na na onni nsɛnkyerɛnne biara kan
"Ɛyɛ hu," sɛnea Ɔbenfo Martin Hewison a ofi Birmingham Suapɔn no ka no.
Ɔka kyerɛ me sɛ ɛmfa ho sɛ ɛabɛyɛ mfe 100 wɔ bere a wohuu vitamin D no akyi no, "rickets no nkɔe ɛda."
"Sɛ yɛwɔ rickets wɔ mpɔtam hɔ a, nnipa pii bɛba a wɔnni vitamin D no."
Ɔka sɛ ɛsɛ sɛ aban no hwɛ aduan a wɔde nkɛntɛnso gu mu wɔ ɔkwan a ɛkɛse so a wɔde vitamin gu aduan mu wɔ ne yɛ berɛ mu. Aman te sɛ Canada ne Sweden wɔ nhyehyɛe a ɛyɛ ɔhyɛ.
Wɔ UK no, nnuan bi te sɛ anɔpa cereals ne nneɛma a wɔde gu burodo so no, wɔde vitamin D abɔ mu dedaw, nanso ɛyɛ nea obiara pɛ na ɔyɛ.
Awɔw bere mu no, nkurɔfo fi ase hwere wɔn vitamin D dodow.
"Ebia yɛbɛgye atom sɛ akuw bi fa ho no, vitamin D supplementation yɛ ade a ɛwɔ hɔ daa," Hewison ka.
Saskia nnɛ di vitamin D aduru a ɛboa no bere nyinaa - na wasan abɛyɛ goalkeeper.
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