160 lbs vs 700 lbs Diet Swap
In a Nutshell
A 160 lb lean person and 380 lb obese person swapped diets for one day while wearing EEG brain scans. The obese participant's 8,312-calorie diet triggered massive reward-center activation and caused the lean host to gain 6 lbs overnight with severe nausea, while the lean participant's 1,994-calorie diet produced satiety with minimal calories. The scans and results show that reducing reward sensitivity, strengthening self-control through resistance training, removing trigger foods, and choosing high-volume low-calorie meals can reverse overeating patterns and support sustained weight loss.
These notes were generated by AI and may contain inaccuracies.
The experiment tests what happens when swapping diets between someone at 160 lbs with 10% body fat and someone over 50% body fat weighing approximately 380 lbs. The 24-hour swap includes Cam eating the diet that produced 10% body fat and the host eating the diet that produced over 50% body fat. Advanced EEG brain scans were conducted one week prior to investigate why some people struggle to stop eating.
Both parties completed weigh-ins before the diet swap, with a follow-up weigh-in scheduled for the next morning to measure weight changes. Breakfast was the first meal of the swap.
Cam's breakfast consisted of a sausage egg griddle, sausage egg muffin, two hash browns, and a large regular Coke totaling 1,674 calories. The host's breakfast included high-protein French toast made with one whole egg and egg whites plus sweetener, caramelized sautéed apples with cinnamon, two slices of turkey bacon, and sugar-free syrup totaling 474 calories.
Cam rated the host's breakfast 9.5 out of 10. The host rated Cam's breakfast 8-9 out of 10. Cam stated he had not had regular Coke in an unknown period of time and could not recall trying sugar-free syrups previously.
All three participants underwent EEG brain scans one week before the diet swap. Phase one involved staring at a plate of McDonald's burger and fries for 5 minutes without eating.
Cam's scan showed significant activation in the reward center located in the front of the brain, appearing as dark red areas. This region determines how irresistible food feels. The host's scan showed minimal reward center activation with most activity shifting to the self-control center, which helps pause and evaluate alignment with goals.
Michelle's scan showed neutral response to food, comparable to viewing inanimate objects like candlesticks. Michelle has been taking Ozempic for the past year, a medication designed to reduce food appeal. She featured in a previous video and agreed to a year-long transformation.
Cam's brain is not permanently fixed in its reward response pattern. Reward sensitivity can be reduced and self-control strengthened. The host's diet incorporates seven science-backed strategies to achieve these changes.
The first strategy addresses food texture. Fast food typically uses soft textures that facilitate overeating. Including solid components with chew slows eating rate and increases satiety. The apples in the breakfast provide this chew factor. This single change may explain why the host finished breakfast while Cam and Michelle were still eating.
Cam's McDonald's breakfast totaled 1,674 calories. The host's breakfast totaled 474 calories, representing less than one-third of Cam's meal calories.
Cam's lunch included a bagel with cream cheese, banana, two granola bars, a cookie, full-sugar Coke, and two cheese strings totaling 1,545 calories. The host's lunch consisted of barbecue chicken fajitas with vegetables, lettuce, wraps, sugar-free barbecue sauce with half-fat mayo, and diet sodas totaling 408 calories.
Cam explained that being on the road makes hot meals difficult, leading to snacking throughout the day. Cam reported drinking four Cokes daily: two at work, two at home, and sometimes one in the middle of the night. Cam wakes between midnight and 3:00 a.m. to drink half a cold Coke from the fridge, then finishes the other half in the morning.
Research shows people switching from full-sugar Coke to diet soda tend to lose weight. One study compared two groups of regular diet soda drinkers: one group stopped diet soda and added water, while the other added more diet soda. The group adding more diet soda lost more weight over the following year and maintained the loss. Diet soda helps eliminate cravings.
Cam's lunch totaled 1,545 calories. The host's lunch totaled 408 calories, under 500 calories. After two meals, the host exceeded 3,000 calories, which would produce nearly one pound of weekly weight gain if sustained.
Cam was always large growing up. Approximately 10 years ago, Cam weighed 130 lbs less than current weight. Following father's death, Cam entered a period of unhealthy lifestyle. Weight gain occurred gradually until clothes no longer fit.
Cam was diagnosed as pre-diabetic one year ago and prescribed medication. Cam's mother and sister have medical backgrounds, increasing awareness that ignoring health issues leads to worsening conditions.
Nicole is Michelle's sister and a nurse. Nicole and her husband previously worked with the host as a case study following Built With Science nutrition and workout plans. Both transformed in a few months. Michelle hopes to achieve similar results. The weight loss medication Michelle takes has not fully resolved her eating challenges.
Nicole reported that food noise disappeared after the transformation, eliminating constant thoughts about cookies or chips. This aligns with phase one brain scan data showing reduced reward response.
Phase two involved eating lunch until full, then being presented with desserts and instructed to eat as much as desired. Michelle's post-dessert scan showed increased reward center activation, indicating she would continue wanting more cake without means of control.
Cam brings home cheesecake when craving cheesecake. Having tempting foods available makes consumption likely. One incident involved six donuts where multiple were consumed. Removing trigger foods from the environment is critical for success.
Cam rated the fajita lunch 6.7 out of 10. The host noted three meal swaps remained at this point.
A basic workout routine was conducted that can be performed twice weekly at home or gym. The goal is preventing muscle loss during weight loss. Cam stated his motivation for change is 100% for Michelle. The host hopes weight training will create personal positive goals for Cam.
Cam demonstrated significant strength during the workout, performing movements that impressed observers. Cam recalled father's advice that it is acceptable to be bigger but not acceptable to let size slow one down. Cam expressed desire to return to previous self after the workout.
Exercise trains the self-control center by requiring completion of difficult tasks despite resistance. Squats that cause huffing and puffing train the brain to proceed despite discomfort. This training transfers to resisting dietary temptations.
Cam reported not feeling lethargic after the host's meals, contrasting with expected response to McDonald's breakfast. Both Cam and Michelle reported feeling light despite portion sizes and stated they would not want to work out after Cam's breakfast.
Cam's snacks included chips, PB&J sandwiches, and Coke. The host's snacks included unlimited baby carrots with hummus and one protein bar. Cam expressed reservations about the snack options.
Cam reported eating chips while doom scrolling on phone or couch. The host eats while watching TV or movies. Research demonstrates that distracted eating leads to consuming more food. In one study, participants ate nearly identical amounts of fresh versus week-old stale popcorn in a movie theater, despite acknowledging the stale popcorn was unappealing.
Watching others eat preferred foods without consuming them trains the self-control center. Resisting available chips and PB&J while eating protein bars and carrots strengthens this brain region. Each instance of resistance at grocery stores or other temptation situations strengthens self-control for long-term benefit.
Total sugar intake reached 306 grams by this point, exceeding six times the recommended daily limit. This raised concerns about physiological response to the next meal.
Cam's dinner included fettuccini Alfredo with Cajun chicken and garlic toast, estimated at 3,000 calories. The host's dinner included sautéed vegetables with ground beef, tomato sauce, light cream cheese, half regular and half calorie-free spaghetti, and Parmesan cheese totaling 572 calories.
The host recommends using smaller utensils to slow eating pace, increasing satiety. Cam expressed preference for larger utensils and discomfort with salad forks.
Cam enjoyed the cheese, noodles, and sauce but was less enthusiastic about vegetables. The host began experiencing cravings for Coke during dinner, noting an addictive quality despite initial discomfort.
Cam and Michelle reported the healthier portions were larger than expected and expressed surprise at feeling satisfied without finishing meals. Both stated they felt satisfied after eating and would not have anticipated this outcome.
Cam's dessert was half a pint of Ben & Jerry's ice cream with Nesquick chocolate milk. The host prepared two ice cream versions using the Ninja Creami: a cheesecake version for Michelle using sugar-free pudding, milk, vanilla protein, and light cream cheese, and a chocolate version for Cam using light chocolate milk, sugar-free chocolate pudding, half scoop of protein, and powdered peanut butter.
Michelle rated the dessert 5 out of 10, preferring not to eat sweet treats after dinner. Cam rated the chocolate version 9.9 out of 10. Michelle's Ozempic was noted as potentially influencing dessert preference.
Cam's daily total reached 8,312 calories with 422 grams of fat and nearly 1,000 grams of carbs. The host's daily total reached 1,994 calories. The host noted the volume did not seem excessive despite the calorie count.
Michelle's metabolism was previously tested at over 3,000 calories burned daily from carrying body weight. Maintaining the demonstrated diet would produce over 2 lbs weekly weight loss without additional changes.
Cam and Michelle described the day as eye-opening and achievable, expressing that success seemed realistic. Both received access to the Build With Science app for food tracking and workout guidance, including two weeks free via QR code.
At 3:00 a.m., the host woke feeling unwell on the bathroom floor with active gag reflex, attributing symptoms to sugar and Coke intake. This reaction had never occurred previously.
Morning weigh-in showed the host gained 6 lbs. Michelle's weight slightly decreased. Cam's weight decreased 3 lbs. A single-day scale change can result from multiple factors. The small positive shifts were hoped to influence Cam's decision to join Michelle's transformation.
The speaker officially joins Michelle on her year-long journey. When asked directly, "Are you going to do this with me or not?" the response is "100% I'm in."
Viewers are encouraged to subscribe to stay updated on the progress. A big thank you is extended to the doctors at Illumind for conducting and interpreting the brain scans. A link to their site is provided below for anyone curious about seeing what's happening inside their own brain.
Keep Jeremy Ethier in your library
Save the videos and channels worth coming back to, and find them again in one place.
