Dear co-vocalisters,
there is one hormonal thing, that relates to weight, c.q.fat: fat tends to absorb testosterone (male hormones) and as far as I know also it's female counterpart. So a man who is fat during his puberty might end up with smaller vocal cords than his thinner counterpart. There is also a syndrome concerning women / girls that are very fat during puberty: I don't remember it exactly, but those girls suffer from more than just a voice that is slightly higher, in general from a hormonal unbalance. With normal women it looks like a chicken or egg question (forgive me the comparison): more oestrogen means more fat, so women with lot of oestrogen (so mostly a higher voice) might give the impression, that their high voice is a consequence of their extra thermal insulation, whereas in reality both are consequences of the high oestrogen level.
Losing a lot of weight will change your hormone levels, but I doubt that this has any effect on the voice. The biggest hormonal change you can image, happens when women get pregnant (more than 1000x the effect of even a 'heavy' (modern) anti-conception pill, so much about the effect of the pill on singing), and I don't know any professional singer who lost her voice after getting a baby. A last warning is about losing weight very fast: fat not only absorbs hormones, but also all kind of unhealthy chemicals, so it can become dangerous.
P.S. How do I know this? A dr.med.-friend of mine, who knows me quite well, lended me one of her books, about hormones and sexuality. For those who get curious now: there is no clear relation between female hormone levels and libido, so the suggestion that a low female voice belongs to a women that is very much interested in sex, is not necessarily right. And as we know from various tenors, a higher male voice does not necessarily belong to a man with an average or less than average libido. Almost no research has ever been done about the relation between hormones and characters. Needless to say, that my personal hypothesis, that hormonal levels change both voice and characters, exactly according to the German Fach System, has never been tested.
Best greetings,
Dré
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