If you have been reading labels you should know by now that abbreviations aren't good news. TBHQ is one to look out for and AVOID! If you aren't reading the ingredients, then I can assure you that you are consuming many chemicals and such.
Tertiary Butylhydroquinone, or TBHQ as it is more commonly referred to as, is in fact a chemical preservative which is a form of butane. The risks and side-effects of this preservative product far outweigh the benefit of it being used as a highly unsafe preservative ingredient.
Consuming high doses (between 1 and 4 grams) of TBHQ can cause nausea, delirium, collapse, tinnitus (ringing in the ears), and vomiting. There are also suggestions that it may lead to hyperactivity in children as well as asthma, rhinitis and dermatitis. It may also further aggravate ADHD symptoms and cause restlessness. Long term, high doses of TBHQ in laboratory animals have shown a tendency for them to develop cancerous precursors in their stomachs, as well as cause DNA damage to them. It is also suggested that it may be responsible for affecting estrogen levels in women.
TBHQ can be found in McDonald's famous chicken nuggets, Kellogg's poptarts, Little Debbie snacks, Red Barron pizzas, Tastykakes, crackers...The list goes on and on...trust me!
Some of this information was taken from this site: Natural News