Popular fitness YouTuber Will Tennyson recently embarked on an ambitious culinary experiment that would test his body and taste buds in ways he never imagined.
He traveled to two drastically different locations to compare the world’s healthiest diet against its unhealthiest counterpart.
The results revealed shocking differences in how food quality affects energy, digestion, and overall wellbeing.
First stop: the picturesque Greek island of Knos to experience the Mediterranean diet firsthand.
Jump to:
- Starting the Day Mediterranean Style
- The Mediterranean Macro Breakdown
- Fresh Food Dominates Greek Grocery Stores
- A Mediterranean Feast at a Family Tavern
- The Secret Behind Healthier Fried Foods
- Dinner in a Castle
- Switching to the American Diet
- Fast Food and Fake Fullness
- Snacking on Empty Calories
- The Dessert Finale
- Beyond Diet: Lifestyle Matters
- The Shocking Physical Differences
Starting the Day Mediterranean Style
Tennyson’s Mediterranean adventure began with traditional Greek coffee, served strong and black in a small cup. The presentation alone impressed him, describing it as looking like “a witch’s potion.”
Espresso is like herbal tea in comparison. There’s some grittiness to it. It is extremely strong.
Breakfast consisted of authentic Greek yogurt topped with walnuts and fresh honey. For someone who considers himself a lifelong Greek yogurt fan, this moment was monumental.
Usually Greek yogurt I get at Walmart is pretty sour. This is actually like a lot more cheesy, a lot more like cream cheese. You must milk the animals differently here to extract such a creaminess.
The yogurt contained only 2% fat despite its incredibly creamy texture, defying his expectations completely.
The Mediterranean Macro Breakdown
Tennyson’s research revealed that the average male in the Mediterranean consumes approximately 183 grams of carbs, 99 grams of fat, and just 80 grams of protein daily. This totals roughly 2,000 calories, significantly lower than typical American consumption.
Rather than hitting the gym, Tennyson embraced the traditional Mediterranean approach to exercise: simply walking around. Research suggests eating a Mediterranean diet may be as beneficial as walking an additional 4,000 steps per day.
Fresh Food Dominates Greek Grocery Stores
Exploring local supermarkets revealed stark differences from North American stores. The largest sections featured dried fruit, mixed nuts, and fresh produce.
Processed food aisles remained deliberately short with limited options. The healthiest choices sat at eye level, while sugary cereals and snacks required bending down to see them.
In these kinds of grocery stores, you’re not overwhelmed by choice, you’re seemingly overwhelmed by freshness over there with the produce, the mixed nuts, the dried fruits.
A Mediterranean Feast at a Family Tavern
Lunch proved to be the main meal, consisting of multiple courses at a family-run tavern. Appetizers included:
- Traditional Greek salad with abundant feta cheese
- Tzatziki and faba spread with fresh bread
- Fried zucchini that somehow didn’t upset his typically sensitive stomach
The main course featured whole seabream, shrimp saganaki with feta, and simple salad with fries. Everything arrived without heavy sauces, letting fresh ingredients speak for themselves.
It tastes like it just swam right on my plate.
When staff noticed his struggle deboning the fish, they immediately helped. This personal attention and slower pace of dining represented fundamental differences from rushed American eating culture.
The Secret Behind Healthier Fried Foods
Despite consuming fried foods throughout the day, Tennyson experienced zero digestive issues. His research uncovered why: Greek cooks traditionally fry foods in olive oil at lower temperatures, preventing the oil from burning and creating a healthier end product.
Snacks included lukamades (traditional Greek donuts) drizzled with honey rather than covered in refined sugar, plus a Fredo espresso that tasted sophisticated compared to American coffee drinks.
Dinner in a Castle
Evening dining took place at a restaurant built into an ancient castle. The chicken souvlaki arrived perfectly seasoned with a blend the chef jokingly said he’d “have to kill him” for revealing.
I don’t know if they have death row in Greece, but if they do, this would be a solid last meal. I’d go out chewing with a smile.
Dessert consisted simply of fresh fruit, a far cry from the indulgent American sweets awaiting him.
Switching to the American Diet
The contrast couldn’t have been starker. Tennyson’s American day would nearly double his caloric intake to 3,864 calories, with 73% coming from processed foods.
Breakfast started with a signature iced caramel craze latte containing 530 calories, 17 grams of fat, and a staggering 74 grams of sugar before any food touched his lips.
It’s like I slit Willy Wonka’s throat and he like bled out into my cup.
The American diner breakfast featured eggs, toast, bacon, sausage, and hash browns. By 11:30 a.m., Tennyson already felt completely exhausted.
Fast Food and Fake Fullness
Lunch at McDonald’s included a Big Mac meal with fries and chicken nuggets. Despite the high calorie count, he felt strangely unsatisfied.
I feel like a big bottomless pit. But that’s what happens when you don’t have good quality food. It just kind of goes right through you and you feel like you haven’t even eaten, but then you also feel hungry.
The gym session lasted only 17 minutes, matching the average American’s daily exercise. He paid $25 for a day pass, working out to just over a dollar per minute.
Snacking on Empty Calories
At 7-Eleven, Tennyson grabbed sour cream and onion chips plus a Little Debbie brownie containing 510 calories alone. The brownie’s taste reminded him of “dog food with cocoa powder.”
Dinner brought fried chicken and waffles with seven-cheese macaroni, accompanied by an old Cuban mojito. The meal looked appetizing but left him feeling progressively worse.
The Dessert Finale
Finishing with apple pie and chocolate chip cookies, Tennyson reflected on consuming fruit and vegetables only through mint in a mojito, apples in pie, and lettuce on a Big Mac.
His verdict was clear: food quality dramatically impacts energy levels, digestion, and overall wellbeing, not just whether someone feels full.
Beyond Diet: Lifestyle Matters
Tennyson emphasized that Mediterranean health benefits extend beyond food choices. The slower pace of life, reduced stress levels, and emphasis on community dining all contribute to longevity.
Everything is much slower paced. There’s less stress and everything is just a lot calmer.
Meanwhile, the average American walks just over 5,000 steps daily compared to significantly higher activity in Mediterranean countries.
The Shocking Physical Differences
After his Mediterranean day, Tennyson felt energized with stable blood sugar and perfect digestion. Following the American diet, he experienced:
- Immediate fatigue despite consuming more calories
- Digestive distress from processed foods and poor-quality oils
- Dehydration from excessive sodium intake
- Mental fog and inability to concentrate
The experiment perfectly illustrated why 70% of Americans are overweight, with the average person carrying an extra 17 pounds.
Tennyson’s journey demonstrates that healthy eating doesn’t require deprivation. The Mediterranean approach celebrates food while prioritizing quality ingredients, balanced macros, and mindful consumption. Meanwhile, the convenience-focused American diet leaves people simultaneously overfed and undernourished, craving satisfaction that processed foods simply cannot provide.
