A significant portion of Suárez’s research focused on the thyroid gland. He identified hypothyroidism (an underactive thyroid) as a primary, often overlooked, driver of obesity. He critiqued the standard medical reliance on TSH (Thyroid Stimulating Hormone) levels as the sole diagnostic marker for thyroid health, arguing that many patients suffer from "subclinical" thyroid issues that go undiagnosed.
One of his most significant contributions was the distinction between the (Parasympathetic) and the Excited Nervous System (Sympathetic). He argued that "one man’s food is another man’s poison." el doctor frank suarez
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