>>1365563>>1365564>>1365611>>1365601Titanium leaches less chemicals into foodstuff than all the rest. Even stainless steel leaches iron, chromium and nickel into foods; though at, "safe," levels after the tenth batch of tomato sauce you've boiled in it.
>aluminium might destroy your brain...https://www.ncbi.nlm.nih.gov/pubmed/24779346https://www.researchgate.net/publication/20956935_Aluminum_a_neurotoxin_which_affects_diverse_metabolic_reactionshttps://www.researchgate.net/publication/261996452_What_is_the_risk_of_aluminium_as_a_neurotoxinhttps://www.ncbi.nlm.nih.gov/pubmed/19568732https://www.ncbi.nlm.nih.gov/pubmed/24779346https://content.iospress.com/articles/journal-of-alzheimers-disease-reports/adr170010https://onlinelibrary.wiley.com/doi/abs/10.1111/nan.12417https://www.sciencedirect.com/science/article/pii/S0946672X17308763?via%3Dihubhttps://www.keele.ac.uk/aluminium/publications/>oilcloth, cooking on rocks and drinking out of waxed leather?Depends on the oil. Pottery is fine, if you are not using something that is lead-glazed; use ash-glaze only without added colors. Learn to make them yourself using a bonfire or mud kiln, it is a pretty rewarding experience. As for wax, only use bee's wax, not petroleum wax.
>cast ironIt only leaches iron, which is fine for most people unless you are exclusively eating acidic foods out of it 24/7. I know one guy who's doctor said he had too much iron in his blood work. He uses cast iron exclusively. For women or anyone who looses blood regularly, cast iron is a good cookware to help replace lost iron.
Even glass cookware leaches chemicals into your foods; boron & silicate for borosilicate-glass for instance.
I live by, "Does this ingredient or leached chemical improve or maintain my health?" and choose my cookware based on that. The hard part is that I require massive stock pots so I end up using stainless steel anyway. I just pre-leach them:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284091/ 
