Those who find that thiamine (vitamin B1) reduces their stuttering may be interested in the following list, mailed to me by an expert, of factors that reduce thiamine levels in the body.
If you find that more thiamine improves your fluency, it makes sense to try and avoid depleting the thiamine in your body where possible - though of course this should be weighed up against the positive effects these factors may have on other aspects of health.
For more information on thiamine/magnesium and their possible impact, if any, on stuttering, read this FAQ. Health Warning: Never take any food supplement without first consulting your medical practitioner.
Here is an exhaustive list of substances and other factors that can affect thiamine utilisation negatively:
- Fever - severe infection/sepsis
- Increased physical exercise; and
- Refeeding syndrome (a metabolic complication that occurs when nutritional support is given to severely malnourished patients).
- Food containing a high level of thiaminases (which impair thiamine), including certain raw freshwater fish, raw shellfish, and ferns. When buying rice, try to get brown rice, as white rice has been milled, which means that most of the thiamine in the rice has been removed.
- Substances high in anti-thiamine factors, such as coffee, tea and betel nuts (it is not just the caffeine in coffee and tea that impacts on thiamine - the tannins in these products also work against thiamine. So also avoid decaffeinated tea and coffee, rather take herbal tea such as rooibos tea.)
- Sulfites are added to many processed foods as a preservative. Sulfites destroy thiamine.
- Foods that are high in simple carbohydrates (in candies, cakes, syrups, sugar, fizzy drinks and others).