What is Reddit's opinion of Staying Healthy With the Seasons?
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It categorizes different health topics by season. The diet advice is outdated in my opinion (written in the fat-fearing 70s, he advises against avocados) and gets into other topics such as seasonal acupuncture (wasn't really applicable to me again).

Having said that, I think it does a really good job of stressing seasonal rotation of diets, seasonal exercises, attitude, energy levels, etc. The way you may behave in Winter will be different than Summer and the food required will be different.

It's kind of an East meets West kind of book as it relies heavily on Eastern homeopathic tradition combined with some of the science of the West. Keep in mind it's old, but still valuable in my opinion.

Edit: it was published in 1981 I just read but you can still see the 70s diet influence.