If you are experiencing significant weight loss resistance, despite your best efforts with a healthy low carb eating plan – you may be suffering from an underactive thyroid. Other signs that your thyroid is not working as it should include: fatigue, brain fog, depression, hair loss, achy muscles, painful joints, sensitivity to cold, dry skin and constipation. The thyroid gland produces hormones that regulate the body’s metabolic rate, muscle control, bone maintenance as well as heart, brain and digestive functions. Unfortunately, when it comes to your thyroid, the road to optimal health can be a long and frustrating one. Many people are told that their blood test results are completely normal and have been sent home with a prescription for an anti-depressant or instructions to get more sleep, eat less and exercise more. This isn’t very helpful when you consider that every single cell in your body requires thyroid hormone in just the right quantity. If you have too little your metabolism will slow down, leading to weight gain or severe weight loss resistance as well as low moods and poor concentration.