diff --git a/education/nutrition/Nutrients.md b/education/nutrition/Nutrients.md
index d5fe0a8..92d9d7f 100644
--- a/education/nutrition/Nutrients.md
+++ b/education/nutrition/Nutrients.md
@@ -16,16 +16,35 @@ A macronutrient is a nutrient the body requires in large quantities, whereas a m
 | Carbs          | Vitamins       |
 | Lipids         | Minerals       |
 | Proteins       |                |
+
 Nutrients are used for:
 - Growth and development
 - Energy
 - Regulation of processes
+
+## Essential Nutrients
+A nutrient is classified as essential if:
+- It must be supplied by food, because the body cannot create it in sufficient quantities
+- If the nutrient is missing, it results in a deficiency disease
+- When added back to the diet, the disease corrects
+- Explanation exists as to why the abnormalities occurred when the substance was missing.
+
+## Phytochemicals
+Phytochemicals are substances in plants that *may* have healthful benefits. Examples of phytochemicals include:
+- Caffeine
+- Beta-carotene
+- Nicotine
+
+## Calories
+In nutrition, the term Calorie typically refers to a kilocalorie, or 1000 calories, where a calorie is the amount of energy needed to heat up one gram of water one degree Celsius.
+
 # Definitions
-| Term               | Definition                                                                                                                                                            |
-| ------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| Nutrients          | The life sustaining substances found in food. Necessary for growth, maintenance, and repair.                                                                          |
-| Nutrition          | The study of how nutrients affect our body.                                                                                                                           |
-| Diet               | A person's usual pattern of food choices. Everyone has a diet, and you don't begin and end diets, you just make changes to your existing diet.                        |
-| Lipid              | Fat                                                                                                                                                                   |
-| Organic            | An organic substance contains *carbon*, and can be degraded.                                                                                                          |
-| Essential nutrient | A nutrient is considered *essential* if it *must* be supplied by food, because the body cannot create it in sufficient quantities. If an essential nutrient is missin |
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+| Term               | Definition                                                                                                                                                                                                    |
+| ------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| Nutrients          | The life sustaining substances found in food. Necessary for growth, maintenance, and repair.                                                                                                                  |
+| Nutrition          | The study of how nutrients affect our body.                                                                                                                                                                   |
+| Diet               | A person's usual pattern of food choices. Everyone has a diet, and you don't begin and end diets, you just make changes to your existing diet.                                                                |
+| Lipid              | Fat                                                                                                                                                                                                           |
+| Organic            | An organic substance contains *carbon*, and can be degraded.                                                                                                                                                  |
+| Essential nutrient | A nutrient is considered *essential* if it *must* be supplied by food, because the body cannot create it in sufficient quantities. If an essential nutrient is missing, it results in a *deficiency disease*. |
+| Deficiency disease | A deficiency disease occurs when an essential nutrient is missing. Examples include anemia (iron) and scurvy (vitamin c)                                                                                      |
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