But perhaps the most eye-opening moment was when Bob and Diane were visiting colleges with their twin children, and Bob just couldn’t keep up with the rest of the family.
"I would say that is definitely one of the saddest moments of his life," his wife of 23 years admits of him having to constantly stop and sit down.
Related: Celebrity weight loss transformations
Shocking celebrity weight-loss transformations
Shocking celebrity weight-loss transformations
Mama June in 2013
Mama June in 2017
The "Honey Boo Boo" star documented her weight loss journey on her very own reality show! She is now down to a size 4 -- and she looks incredible!
Khloe Kardashian in 2012
Khloe Kardashian in 2016
Hard work does pay off! The youngest Kardashian sister is obsessed with exercising and documents all her workout sessions on social media.
Lena Dunham in 2015
Lena Dunham in 2017
The "Girls" star lost a significant amount of weight after going on a holistic diet to help alleviate symptoms of endometriosis.
Wendy Williams in 2012
Wendy Williams in 2017
The TV personality revealed in 2015 that she lost 50 pounds over the course of three years with a healthy diet that doesn't include refined sugars, meat, dairy or "eating after dark." It looks like she's been committed to the strict diet. She looks better than ever in 2017!
Ricki Lake in 2010
Ricki Lake in 2011
The actress lost 20 pounds when she appeared on "Dancing With the Stars" in 2011.
Jordin Sparks in 2008
Jordin Sparks in 2017
Hard work pays off! "American Idol" alum began her weight loss journey by walking around her neighborhood and the rest was history! Her favorite workout? Zumba.
Sara Rue in 2003
Sara Rue in 2016
The "Rules of Engagement" star is a total fan of Jenny Craig for its simplicity. She looks incredible and totally glowing!
Jonah Hill in 2014
Jonah Hill in 2017
Talk about a transformation! Hill has lost weight and gained weight through the years -- depending on the movie he's working on -- but his latest transformation is absolutely jaw-dropping.
Christina Aguilera in 2012
Christina Aguilera in 2013
Smoke show! The songstress dropped 20 pounds over the course of one year. Doesn't she look incredible?!
Miranda Lambert in 2012
Miranda Lambert in 2013
The country crooner slammed critics who accused her of having weight loss surgery. She revealed that she dropped the pounds the old-fashioned way -- eating right and working out with her trainer!
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So, the following January, Bob joined a weight loss center -- and he lost 12.5 pounds during his first week.
"It was a fight every day," Diane admits, but today, after losing 111 pounds, Bob is nearing the weight he was when he and Diane first met decades ago.
The only remaining problem, according to his wife? His clothes are way too big now!
(He actually uses hair ties to hide extra fabric.)
That’s why Diane nominated her hubby for one of our famous makeovers!
We enlisted the help of lifestyle expert Tommy DiDario, and let’s just say Diane LOVED the end result.
Watch the video above to see the big reveal!
Related: Tips for seniors
14 weight loss tips for seniors
14 weight loss tips for seniors
Take a daily walk
Taking a walk everyday is good for the body and the mind. Walking outside is a quiet time for the mind to relax and unwind, while giving your body low impact exercise. Walking just a mile every day keeps your muscles and joints engaged so that they maintain and improve their strength.
Get active with a new hobby
Take up a physical hobby like dancing, yoga, or water aerobics instead of -- or in addition to -- something sedentary like bingo or bridge. Keeping up the physical activity will help you keep the mobility you have and may even increase flexibility and range of movement. And you may even make some new friends.
Participate in Meatless Monday
Meat is a concentrated form of calories that can pack on the pounds if not eaten in the right portions. Choosing one or more days a week to go vegetarian can help lower the caloric load of the day, giving your body a chance to burn off excess fat. When going vegetarian, don't just substitute with cheese, which is equally rich in fat. Instead, opt for low calorie veggies like mushrooms or soy based tofu.
Drink a lot of water
Drinking water should be obvious, but many people of all ages drink less than they should and are dehydrated on a regular basis. Older people are at an especially high risk of being hospitalized due to dehydration. Carrying a water bottle wherever you go and knowing how many full bottles you should drink per day is a good way to start paying attention to your water intake.
Eat plenty of oatmeal
Eating oatmeal for breakfast is heart healthy, filling, and satisfying. In addition to lowering and maintaining healthy cholesterol, oatmeal is packed full of fiber, which keeps your bathroom schedule regular and promotes weight loss. Mix up the flavors by adding different fruits, nuts and spices for variety.
Eat more fruit as a snack
Fruits are a delicious source of natural sugars, antioxidants, vitamins, minerals and fiber. Keeping fruit on hand as a go to snack and dessert is a healthy and low calorie way to satisfy a sweet tooth. Be sure to ask your doctor about which fruits may interact with any medication.
Have a salad every day
Eating a daily salad ensures that you get at least a few servings of vegetables in your diet. There are so many variations on salads that use both cooked and raw vegetables that it's easy to have a different salad every day of the week. Be careful when adding dressing since they are often full of salt and calories from fat.
Get a dog to keep moving
Dogs are not only a source of loving companionship, they are also the key to getting daily exercise. Dogs need to be walked at least a few times a day, and also love to play outside. Just by taking good care of your dog, you will be more active, which can help trim off those extra pounds.
A few minutes of stretching during the day can help keep muscles long and lean. Building muscle mass is good for cardiovascular health and also helps the body burn excess fat. Start with a simple routine and gradually build to it to keep a consistent level of challenge to your daily stretches. And be sure to talk to your doctor before starting a new exercise routine.
Steer clear of alcohol
Alcohol is full of empty calories that cause weight gain. This doesn't mean you can't enjoy an occasional drink or a small glass of wine with dinner, it just means that keeping alcohol intake low will help avoid going overboard on empty calories.
Plan your meals ahead of time
Planning meals in advance ensures that meals are portioned correctly and include a balanced nutritional load. If you wait until you are hungry to figure out what to eat you are more likely to give in to temptation or opt for comfort food that may not be healthy.
Take a fiber supplement
Fiber keeps things moving in our digestive tracts, which helps eliminate unused and harmful substances. Keeping a healthy flow of digestion promotes weight loss while reducing inflammation. Getting fiber from plenty of fruits and vegetables in your diet is best, but adding a gentle fiber supplement can also increase weight loss.
Grow a garden
Having a garden is a relaxing and fun hobby that provides low impact exercise, and also promotes savings on fresh flowers and produce. If you include herbs and vegetables you'll be able to enjoy the fruits of your own labor, which will become a healthy part of your routine.
Ditch the soda (and juice)
Soda, juice and other sweet beverages are full of sugar, which are empty calories. Eliminating these culprits from your diet can be a one step process to losing a few pounds. In addition to weight loss, cutting out refined sugar as much as possible is a healthy choice for people of all ages.