Unhealthy ways of burn fat

1. Excessive Fasting
Although fasting can certainly have some life-extending and “cellular cleanup” benefits, you can definitely overdo frequent periods of calorie restriction. Excessive fasting causes sleeplessness, anxiety, and loss of fertility, among a myriad of other hormonal dysregulation symptoms…

…especially among women.

Yes, it may seem sexist or unfair, but it seems that men simply do better heading off into the hills to hunt, gather or fight in a state of calorie restriction – while the same scenario sends many women into a complete metabolic tailspin. You can read a very good article that digs into this issue more at “Shattering the Myth of Fasting for Women: A Review of Female-Specific Responses to Fasting in the Literature“. I highly recommend you give it a read if you’re a female and you want to try fasting. I’ve personally found that when it comes to maintaining health and hormonal status for the female clients I train (and many of the very lean guys), a complete 24 hour fast done once or twice per month is far more effective than daily 12-16 hour intermittent fasting (which seems to be all the rage these days).



2. Carbohydrate Restriction
Sure, there are certainly neurological and metabolic benefits to high fat intake – and a very high fat ketosis diet can be a cool biohack – but excessive carbohydrate restriction can cause some serious issues. For example, carbohydrates are necessary for proper thyroid activity (specifically conversion of T3 to T4), and also because high concentration of free fatty acids can actually inhibit proper thyroid binding to it’s cell receptor, a very high fat diet that excessively restricts carbohydrates lowers metabolism and causes weight gain by inhibiting thyroid activity.

So how few carbohydrates are too few?

In a healthy, active individual, around 50-100g of daily carbs seems to be a “sweet spot” for maintaining good energy levels and weight loss. In a hard-charging athlete such as an Ironman triathlete, marathoner or Crossfitter, 100-200g of carbohydrates can be necessary. I’ll admit that on an easy rest day I will sometimes eat just 25-50g of carbohydrates, but that’s certainly not a daily practice for me, and if you’re engaging in that level of carbohydrate restriction, I’d highly recommend you pay attention to important markers of metabolism such as morning body temperature, dry, cracked skin, and enormous sugar cravings accompanied by very low energy levels.