Read more: 鈥�Immune retune: Recharging your body鈥檚 natural defences鈥�
What better way to engineer the perfect immune system than to start from scratch? While you can鈥檛 do that for yourself, you can with your children. In the womb, babies automatically share their mother鈥檚 antibodies, which cross the placenta. This antibody donation can continue after birth through breastfeeding.
Breast milk is chock-full of immune-boosting ingredients. There is lactoferrin, for instance 鈥� a protein that inhibits the growth of bacteria 鈥� and sugars that block bacteria from binding to the body鈥檚 cells. Breastfeeding reduces infection rates, particularly in the developing world.
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There is another way of furnishing a child鈥檚 immune system with first-class defences that is quick, relatively cheap and arguably one of medicine鈥檚 greatest achievements: vaccination against a dozen or more fatal diseases, available at a clinic near you.
Unfortunately, some anti-vaccine campaigners claim this amounts to 鈥渙verloading鈥� the immune system 鈥� an idea that has no basis in fact considering the millions of microbes we face down in every speck of dirt. The few antigens within a vaccine, even multiple vaccines given at once, are a , according to the World Health Organization.
鈥淐onsidering the millions of germs in every speck of dirt, a few vaccines at once cannot overload the immune system鈥�
Some childhood diseases, though, are caused by immune defences going into overdrive, including asthma, eczema and allergies to pollen or foods. We know that children are less likely to get such allergic conditions if they grow up on farms or have pets, lots of siblings or spend time in daycare.
The hygiene hypothesis says that allergies are on the rise in the west because these days children aren鈥檛 exposed to enough germs. 鈥淚f your environment at an early age is too clean, you鈥檙e not developing cells to respond to it,鈥� says Arne Akbar, an immunologist at University College London. While no one is suggesting neglecting basic hygiene, the general advice is to 鈥渓et kids be kids鈥�, and allow them to play in the mud.