As she travels through Copper Canyon, Mexico to Cameroon, West Africa to Iceland-where locals manage to avoid depression in one of the darkest and coldest regions in the world-and beyond, Miller finds that, in each case, local diet plays a key role. Many of her overarching tips will sound familiar (eat fresh foods, eat more fish, avoid refined sugar, watch the salt, etc. ), but a handful of suggestions, such as eating fermented foods and using mushrooms to fight cancer, should come as news. Miller's work is consistently informative and educational, if at times meandering; each "cold spot" is accompanied by a specific regimen, and Miller's practical advice and recipes are all geared for the novice. Anyone unafraid of modifying their diet will find this anthropological diet guide useful.