Can you explain to me why we don’t get sick when on failsafe? Something to do with improving your immune system? I practically gloat when everyone around me moans about their colds and flus they have all the time as I don’t get them anymore!! What a relief to not have infections from colds every year now! - Rosemaree (failsafe 8 years), by email

Comment from Sue: see our answer to this very interesting question -

A. It is common for failsafers to report that they no longer suffer frequent colds, flu and recurrent infections once they are established on failsafe eating (e.g. see stories [874] and [848]) - and yes, there is scientific evidence. Studies have shown that certain artificial colours and preservatives act as immunosuppressants, that is, they can actually suppress the immune system, making us more likely to suffer from recurrent infections. This has been shown in the laboratory by Greek researchers with artificial colours tartrazine (102) and amaranth (123) using small doses normally considered to be nontoxic, and by Brazilian researchers with propionic acid which is part of the group that includes bread preservative 282. As well, a US study with beagle dogs showed they were more susceptible to fatal viruses when fed indigotine (132). Failsafers who are salicylate-sensitive know that although we are constantly told to eat fruit to build up our immunity, for us, it works the opposite way. We are better off eating failsafe vegetables such as cabbage as described in the Myths of Fruit.

Scientific references

Koutsogeorgopoulou L and others Immunological aspects of the common food colorants, amaranth and tartrazine.Vet Hum Toxicol. 1998;40(1):1-4.

Wajner M and others Inhibition of mitogen-activated proliferation of human peripheral lymphocytes in vitro by propionic acid.Clin Sci (Lond). 1999;96(1):99-103.

Hansen WH and others Chronic toxicity of two food colors, brilliant blue FCF and indigotine, Toxicol Appl Pharmacol. 1966;8(1):29-36.