I've never read a book that's so informative yet so unreliable at the same time. This book is a good jumping off point to start your own research or discuss with your doctor, dietitian, or naturopath, but approach it with caution and skepticism.

And I mean serious CAUTION:

You may learn a lot. The text is readable and informative. Briden goes into great detail on how hormones change over the course of your cycle, how they work and interact in your body, and how this might influence any symptoms you may have. There's also sections that look at specific period symptoms, menstrual conditions, and tips for talking to your doctor.

But not all the claims are reliable. Briden often makes unbacked or exaggerated claims and supports some claims with debunked or iffy research. If you filter the bad reviews on Goodreads, other readers have flagged some errors but still fact check all her claims if you're acting on them.

And the solutions are largely terrible. I'm sure there is some good advice in here, but Briden's two solutions for every situation are (TW: eating disorders)

1. completely eliminate certain foods and behaviours from your diet and 2. introduce supplements.

Although, she does emphasize it's important to eat enough calories, carbs, fats, and proteins. 

It may be good to reduce certain foods from your diet (and maybe eliminate them entirely if they are causing serious medical problems), but

Briden recommends extremes that are most likely unnecessary and I doubt would be recommended by most professionals. Some supplements are necessary and have great health outcomes, but they're expensive, unregulated, and have many unknowns. If you find yourself wondering, "do I need to take this supplement?", please ask yourself, "am I eating enough of X" or talk to a professional before you go the supplement route. There are supplements she recommends that have the same doses as a single serving of food (e.g., brazil nuts for selenium, turmeric latte or curry for curcumin). If you do take the supplement route, go one at a time, watch carefully for improvement, and make sure other lifestyle changes aren't responsible for the results --- save your wallet if you can!

Repetition not so bad. It can be repetitive reading cover-to-cover because Briden pulls from the same suite of solutions for most issues, but the repetition will make referencing back easier as you tackle individual challenges.