Ever heard of the “sunlight” diet? It’s all natural, and totally free … but apparently there’s one major side effect. Death.

A woman from Switzerland learned that the hard way after she reportedly starved to death after going on a so-called spiritual diet that required her to stop eating or drinking, and instead, living off sunlight alone.

Swiss newspaper Tages-Anzeiger reported Wednesday that the unnamed Swiss woman, who was in her fifties, chose to adopt the sunlight only diet after she watched an Austrian documentary in 2010 about an Indian guru who claims to have lived off nothing but sunlight for 70 years.

According to Tages-Anzeiger, the woman stopped eating and drinking for a week straight (and even spat out her own saliva) while consuming only sunlight and air.

She stopped her sunlight only diet at the urging of her children, but eventually resumed, and was found dead at her home in January 2011.

An autopsy showed that the woman simply died of starvation, and no other factors contributed to her death.

Tages-Anzeiger says there have been similar cases of folks dying after starving themselves with this radical sunlight-only diet in Germany, Britain and Australia … which proves that no human being can simply live off air and sunlight alone.

[Sources: Herald Sun, Tages-Anzeiger]