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 ## Types of Studies
 ### Experimental
-- A *systematic way* of testing a hypothesis
-
+- A *systematic way* of testing a hypothesis.
+- Animal vs human
+- Treatment vs control
+- There's a degree of *control* present.
+- Can be used to test causation.
 ### Epidemiological
-- An observational stu of the occurrence, distribution, and associations between factors and health or disease in a population.
+- *Observations* of the occurrence, distribution, and associations between factors and health or disease in a population.
+- Observations at one point or over time.
+- **Case Control:**
+	- Cases matched with controls and information is gathered
+	- **Cohort** (2 types):
+		- Retrospective: Collect info about a group's past exposures and identify current outcomes
+		- Prospective: group of healthy people that are followed over time and the outcome noted.
+	- Most common for use on humans.
+- **Never** used to determine *causation*, only correlation.
 
+- Human experimental studies are usually **double blind**, meaning neither the investigators nor the subjects are aware of the group assignment. 
 # Definitions
 | Term           | Description                                                                                |
 | -------------- | ------------------------------------------------------------------------------------------ |
 | Nutrient-dense | Nutrient-dense food supplies more vitamins and minerals in relation to the total calories. |
+| In vivo        | Experiments using entire living organisms                                                  |
+| In vitro       | Experiments on cells and other components.                                                 |