Will Tennyson Puts Mediterranean Day vs American Day Diets to the Test

[Will Tennyson]

When fitness YouTuber Will Tennyson decides to test the healthiest diet in the world against the unhealthiest one, you know it’s not going to be a calm salad comparison. He goes all in—first in Greece, then back in America—to see how food quality, culture, and calories really affect how you feel.

A Day in Greece: Olive Oil, Honey, and Happiness​

Will lands in Naxos and kicks off the Mediterranean diet the way Zeus intended—with thick Greek yogurt, honey, and walnuts. The yogurt alone makes him question every grocery-store tub he’s ever bought. Add in black Greek coffee strong enough to wake Poseidon and a mid-day walk through postcard-perfect streets, and he’s already glowing.

Lunch is fresh sea bream, shrimp saganaki, and crisp tomatoes that taste like candy. Everything’s cooked simply—no sauces, no secrets, just clean food and olive oil magic. Even the fried zucchini somehow feels healthy. By dessert (honey-dipped loukoumades and espresso), he’s full but light, calling it “a forehead kiss from Zeus.”

Calories: Under 2,000. Feeling: Energized, calm, and yes—digestively perfect.

A Day in America: Sugar, Grease, and Guilt​

Then Will flies back to the land of drive-thrus. Breakfast starts with a 530-calorie caramel latte that tastes like “melted ice cream and regret.” Add sausage, hash browns, and toast, and you can almost feel his arteries sending an SOS.

Lunch? A Big Mac meal with extra nuggets and Diet Coke “for balance.” Midday snack? Sour cream chips and a Little Debbie brownie that “tastes like cocoa-flavored dog food.” Dinner goes full Southern—fried chicken and waffles with seven-cheese mac and cheese—followed by pie and cookies in bed.

Calories: 3,800+. Feeling: Bloated, sluggish, dehydrated, but weirdly still hungry.

What He Learned​

The results aren’t subtle. Greece left him energized and satisfied all day on half the calories. America left him stuffed yet starving, with energy swings and cravings by the hour. The difference wasn’t just food—it was pace, portion, and purpose. Greeks walk more, stress less, and actually enjoy what they eat.

Will’s takeaway: food is medicine—or poison, depending on how you use it. You don’t need to eat like a monk, just cook like a local. Use olive oil, eat fresh, and walk a little more.

Watch the full video below and see both diets in action.