Depression and Anxiety
The brain is like the heart, lung, liver, intestine or any other organ. It needs nutrients to ensure proper function. The function of enzymes and neurotransmitters and the integrity of the nerve tissue are all affected by nutrition. When there is a chemical imbalance through poor nutrition or any other reason, the brain can be adversely affected; this can manifest itself as depression or anxiety.
This is not to say that past trauma and other issues addressed by psychologists are not valid, but good biochemical health will make the task of ending depression or anxiety easier. Something as simple as hypoglycemia (low blood sugar) can cause depression.
Problems like poor adrenal function, poor thyroid function and even food allergies can all cause depression or anxiety. Hypoglycemia, vitamin deficiency and poor diet are also a source of problems.