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Low energy levels are often linked to a nutrient deficiency, an underactive thyroid, or a hormonal imbalance. Certain health conditions, like diabetes, might also cause low energy levels.

Nutrients, your liver function, and certain hormones play a big role in how you perform and recover from exercise. They can also affect your sleep — which is one of the most important things for helping your muscles repair themselves.

These tests are useful indicators of your heart and bone health, as well as your diabetes risk. And because you’re more at risk of some nutrient deficiencies with age, like vitamin B12, it’s a good idea to monitor these.

Feeling low, irritable, or finding it hard to concentrate are often linked to nutrient deficiencies and hormonal imbalances. They might also increase your risk of developing a mental health condition, like anxiety or depression.

Sleep problems, like trouble falling asleep or waking up a lot, are often linked to nutrient deficiencies, liver function, or certain health conditions. Poor sleep can also increase the inflammation in your body, which you can check with a CRP test.

Finding it hard to lose weight or putting on weight for no reason is sometimes linked to an underactive thyroid or low levels of the hormone testosterone. If you do carry some excess weight, it’s also worth checking your liver function and diabetes risk.