California Agriculture in the Classroom

FoodMASTER: Fats and Oils

Grade Level(s)

3 - 5

Estimated Time

Three 60-minute activities plus optional activity

Purpose

Students will identify the farm source of common dietary fats, compare Nutrition Facts labels and perform a taste test of various salad dressings, learn the chemistry of emulsification, and compare regular ice cream, reduced-fat ice cream and fat-free ice cream.

Materials

Activity 1:

Activity 2:

Activity 3:

Essential Files (maps, charts, pictures, or documents)

Essential Links

Vocabulary

unsaturated fats: healthier fats such as monounsaturated and polyunsaturated fats

trans fats: man-made solid unhealthy fats

saturated fats: less healthy fats

mouth feel: the way food feels in your mouth due to temperature, creaminess, dryness or moisture

interface: the line between two layers of liquids that don’t mix

immiscible: two liquids that won’t mix (they naturally separate)

emulsifier: a substance that keeps two immiscible liquids from separating

Background - Agricultural Connections

Introduction to FoodMASTER:
FoodMASTER (Food, Mathematics and Science Teaching Enhancement Resource) is a compilation of programs aimed at using food as a tool to teach mathematics and science. It is our theory that if food is used as a tool to teach mathematics and science, students will be better prepared to demonstrate and apply mathematic and scientific knowledge. Because students encounter food on a daily basis, they have preexisting contextual experiences preparing them for learning new and relevant mathematics and science material.

Food is conducive to hands-on and virtual, inquiry-based, active learning that uses multiple senses to engage students in the learning process. Utilizing food allows for an interdisciplinary approach to learning concepts and ideas in a variety of scientific subjects like general science, biology, chemistry, microbiology, nutrition and health. Additionally, food labs are a dynamic way to teach mathematics concepts such as numbers and operations, algebra, geometry, measurement and problem solving.

The knowledge and skill development that can be inspired by the FoodMASTER approach is limitless. Proper use of measurement tools, data collection and interpretation, application and generalization, classification and organization, graphing and comparative analysis, understanding chemical changes, observing functions of ingredients and controlling variables, pricing, critical thinking, self-directing learning, and team building are only a few of the potential knowledge and skill development areas for intermediate grade students experiencing FoodMASTER’s scientific inquiry labs.

Additional FoodMASTER lessons can be found to cover health and nutrition topics such as: Food Safety, Vegetables, Fruits, Milk and Cheese, Meat, Poultry and Fish, Eggs, Grains, Measurement, and Meal Management.

Background for this lesson:
Fat is a nutrient found in foods. The body uses fat for energy, growth and nerve and brain functions. Everyone needs some fat in their diet. However, many Americans eat too much fat. Fats are high in calories and the wrong kinds of fat can be unhealthy. For this reason, it is important to learn which fats are healthier and which are less healthy.

In this lesson, students will:

  1. locate serving sizes, calories, grams of total fat, grams of saturated fat and grams of trans fat on food labels;
  2. use correct unit labels;
  3. record data in a table and practice multiplication skills by calculating the number of calories from fat in each type of salad dressing;
  4. explain why one salad dressing is healthier than another;
  5. use new vocabulary such as immiscible and emulsify; and
  6. practice measurement skills and perform an experiment and make reasonable conclusions.
  7. locate serving sizes, calories and grams of total fat on food labels
  8. record data in a table, use correct unit labels and complete a bar graph; and
  9. be able to discuss mouth feel.

Interest Approach – Engagement

  1. Ask your students, "What is fat?"  "Is fat necessary in our diet?"  Inform students that everyone needs some fat in their diets.  It's true that many Americans eat too much fat, which can be unhealthy.  However, some fats and fat in moderation is a healthy part of our diet.
  2. Make a list of the following foods on your board:
    • Hamburger
    • Tomatoes
    • Ham
    • Vegetable Oil
    • Wheat
    • Corn
  3. Ask a volunteer to circle all of the food items that begin its production on a farm. Ask another volunteer to identify where each food item originates. (Hamburger is meat from cattle, ham is meat from pigs, and wheat, corn, and tomatoes are all plants grown by farmers for us to eat.)  Likely, students will not know that oil is also produced by a farmer.
  4. Explain to students that the seeds of many plants contain oil.  A farmer grows the plant, harvests the seeds, and then presses the seeds to extract the oil.  Some of the plants grown for their oil include: corn, safflower, canola, cottonseed, sunflower, or soybeans.
    • If needed, help your students understand that the oil used when making a cake or brownies and the oil their parents cook with is the type of oil extracted from seeds.

Procedures

Activity 1: Dress it Up
Scientific Inquiry: Reading Labels

  1. Read Dress it Up and complete the Doodle Bugs.
  2. Review label reading. Explain that the Nutrition Facts on food labels tell you how many calories, grams of total fat, grams of saturated fat and grams of trans fat are in foods. Sometimes grams of monounsaturated and polyunsaturated fats are listed too. Show the class where to find serving sizes, total calories, total fat, saturated fat and trans fat on the Nutrition Facts label. Point out the different units of measurement such as tablespoons, calories and grams.
  3. Give each student or pair of students a set of food labels. Instruct your students to complete the Salad Dressing Nutrition Facts table. Remind students to record units of measurement.
  4. Students may work independently, in pairs or as a class to complete questions one to six.
  5. Place several vegetables and one tablespoon of each salad dressing on each student’s plate.
  6. Students will dip vegetables into the salad dressing to complete a taste test. Instruct students to answer the remaining questions.

Activity 2: Emulsify This
Scientific Inquiry: Immiscible

  1. Prior to beginning the activity, label the jars using small strips of masking tape and a permanent marker. Each group will need a jar labeled “A” and a jar labeled “B”.
  2. Read Emulsify This and complete Doodle Bugs.
  3. Separate the class into groups of four to eight students.
  4. Review the new vocabulary words: immiscible (liquids that normally don’t mix), emulsify (to blend), emulsifier (a substance that keeps two immiscible liquids from separating), interface (the line between two layers of liquids that don’t mix).
  5. Students will follow the Scientific Inquiry: Immiscible instructions to complete the lab.
  6. Students will take turns measuring the ingredients and shaking the jars.
  7. While observing the separation of the vinegar and oil, the class may discuss other kitchen emulsions such as mayonnaise, salad dressing, peanut butter and milk.
  8. After several minutes of observation, instruct students to complete the questions.

Activity 3: Mmmm Creamy
Scientific Inquiry: We All Scream for Ice Cream

  1. Read Mmmm Creamy and complete the Doodle Bugs.
  2. Pass out the Nutrition Facts labels for each ice cream to each student or pair of students.
  3. Review where to find serving sizes, calories and total fat on the Nutrition Facts labels.
  4. Then instruct students to complete the Ice Cream Nutrition Facts table. Remind students to record the units of measurement.
  5. Once students have completed the table, they will use the data to complete the bar graph.
  6. Finally, serve each student a small sample of each type of ice cream in his or her small cups. Ask students to label their cups “R” for regular, “RF” for reduced fat and “FF” for fat-free.
  7. Students will taste the ice cream and complete the Ice Cream Taste Test Facts table. Encourage students to use descriptive words when completing the chart.
  8. Students will finish the lab by answering questions one to three.

Concept Elaboration and Evaluation

After conducting these activities, review and summarize the following key concepts

Enriching Activities

Suggested Companion Resources

Sources/Credits

Author(s)

FoodMASTER

Organization Affiliation

FoodMASTER