Introducing Energy Density: The Science Behind Your Spooky Snacks

Ever wondered which candy would keep a zombie sprinting the longest during a midnight chase? Today, we’ll uncover the sweet science behind your favorite spooky snacks, and find out which ones pack the most fuel for fright! 

Before we dive into the candy cauldron, let’s talk about energy density. Energy density is the amount of energy stored in a substance per unit of mass or volume. When we talk about the energy density of food, we measure it in calories per gram (Cal/g), showing how much energy your body gets from each treat.

Energy Density = Calories ÷ Grams

Some snacks, the true monsters of the food world, are supercharged with energy! Candies loaded with fats and sugars (like chocolate bars or peanut butter cups) have high energy density, meaning they deliver a big energy punch in every bite. Others, like popcorn and string cheese, have low energy density. They’re light, full of water and fiber, and less likely to supercharge your zombie chase.

Just like a car burns gasoline to move, your body burns food for energy. In this activity, you’ll measure and compare the energy density of different candies to discover which sweet would keep a zombie going the longest. 

Energy Density vs. Nutrition: Trick-or-Treat for Your Body

Beware! High energy density doesn’t always mean something is good for you. A food can be bursting with calories yet be haunted by a lack of nutrients. Candies and desserts are classic examples of high energy density but low nutrient density. They’ll give you energy, but not much else.

On the other hand, fruits, vegetables, and whole grains may not seem as thrilling as a candy bar, but they’re the real heroes in disguise. These foods have low energy density (fewer calories per gram) but are packed with vitamins, minerals, and other nutrients your body needs to stay strong. . . and alive!

So when you’re deciding between a spooky snack and a wholesome bite, remember: energy-dense foods give you a zap of energy, while nutrient-dense foods keep your body running smoothly long after the candy buzz fades. The goal is to regularly fuel your body with foods that are both energy-dense and nutrient-dense.

Step 1: Make Your Predictions

Choose 5 candies or sweets from a source provided to you by your teacher. Before collecting or calculating any data, hypothesize their order from most energy dense to least energy dense. Explain your reasoning for your decisions.

Step 2: Collect Data and Calculate

Now record the nutrition information of the candies you chose in the table below, and calculate the energy density of each.

Extension: Create a bar graph showing each candy’s energy density (Cal/g)

• Include a title.
• X-axis: Candy Names
• Y-axis: Energy Density (Cal/g)

Step 3: Analysis and Reflection

1. Trick or Treat Survival: Based on your calculations and considering energy density alone, which candy would fuel a zombie’s midnight chase the longest? Which would leave the zombie trailing behind? Explain why.

2. Predictions Check: Compare the true ranking to your prediction. Were your guesses correct? Which candies surprised you in their ranking? 

3. Real-World Application: Athletes, hikers, and adventurers need foods that are both energy-dense and nutrient-dense. Imagine you are packing for a hike, and can choose a candy bar, apple slices, or mixed nuts as a mid-hike snack. Which would be the best fuel for your adventure, and why?

4. Real-World Connection: Higher energy-dense fuels include natural gas, coal, and uranium, while lower energy-dense fuels include wood, ethanol, and biomass. How is choosing fuel for an energy power plant like choosing a snack for your body?

5. Health and Energy: Even though some candies give you more energy per gram, does that always mean they are the best choice? Why or why not?