There’s a phenomenon I’ve see happen again and again. A husband and wife realize they’ve been enjoying their after-dinner snacks a bit too much and are seeing the numbers on the scale rise. They decide to embark on a healthy diet to shed those excess pounds and, ideally, lose weight fast. Two months later, the husband’s shed serious pounds and is looking trim, while the wife struggles to get the scale to budge, even after a diet full of kale salads and grilled chicken breast.
We pulled the top 14 of the best commercial diets (marketed to the public for profit) and the top 12 of the best diets overall. We also threw five of the most popular diet apps into the mix. Since these are largely tracking devices that don’t espouse unique eating habits, they don’t appear to meet US News’ definition of diet, but are still potentially effective weight loss tools.
If you watch TV often, you've probably seen a commercial pop up for Jenny Craig. When you do the diet, you receive a unique weight loss plan for your specific lifestyle and have a personal consultant to check in with at least once a week. And, the meals are delicious: There are more than 100 menu items to choose from for your meals, which are five a day plus one snack of your own.
One advantage of a commercial weight loss program is that you mitigate your risk of side effects when compared with a diet cobbled together yourself.  There’s a lot that can go wrong in a diet; if you restrict your food intake too severely, you’ll be missing out on vital micronutrients or your macronutrient balance can get thrown off.  In contrast, if you are too lax, you won’t end up losing much weight.
The Mayo Clinic Diet is generally safe for most adults. It does encourage unlimited amounts of vegetables and fruits. For most people, eating lots of fruits and vegetables is a good thing — these foods provide your body with important nutrients and fiber. However, if you aren't used to having fiber in your diet, you may experience minor, temporary changes in digestion, such as intestinal gas, as your body adjusts to this new way of eating.
“Diet and exercise are a marriage that should never divorce,” said Giancoli, noting that the benefits of exercise aren’t restricted to the sheer number of calories you burn during thirty minutes on a treadmill. (Need one of those, by the way? We have some favorites.) Instead, research shows that muscle tissue burns more calories than fat tissue, proving that “muscle mass is a key factor in weight loss.”
Then, there’s biochemistry. In women, ghrelin — the “I’m hungry” hormone — spikes after a workout, while leptin — which tells the brain ‘I’m full!’ — plummets, according to a 2009 study in the American Journal of Physiology — Regulatory, Integral and Comparable Physiology. Not so in men. So post-workout, women tend to eat more, which puts them at risk to gain weight. Men don’t experience this same hormonal fluctuation.
If planning for and preparing healthy foods is the biggest obstacle to your weight loss, look no further than Jenny Craig. The program delivers prepackaged food to your home; you just heat (or open) and eat, and experts and users say the food tastes good, too. There's no counting calories, no forbidden foods, and little planning required. Reviewers say Jenny Craig is an ideal program for someone who wants a no-hassle diet. It's pricey, though, and, there's very little room for eating out or home-cooked meals.
What the diet advocate says: Controversial Canadian psychologist Jordan Peterson is a fan, crediting the diet for curing his daughter’s various ailments, from juvenile arthritis to depression. But it was popularised by Shawn Baker, author of the aptly titled ‘The Carnivore Diet’ – in which he describes the diet as ‘a revolutionary, paradigm-breaking nutritional strategy that takes contemporary dietary theory and dumps it on its head’.
People were not asked to count calories at all. Over the course of a year, both groups attended 22 classes reinforcing these very sound principles — and all participants had access to health educators who guided them in behavioral modification strategies, such as emotional awareness, setting goals, developing self-efficacy (also known as willpower), and utilizing social support networks, all to avoid falling back into unhealthy eating patterns.
If you’re already enjoying and eating foods high in fat along with protein, you might want to consider going on the keto diet. It’s been proven to be more effective at weight loss than a low-fat diet, and you’ll likely have an easy time transitioning to it. (9) Among my weight loss tips, going keto is the diet that produces the quickest results alongside significant health changes.

"Your body needs a healthy balance of exercise and rest. Doing too much prevents the body from shifting excess fat. Exercising without rest can impact our levels of the steroid hormone cortisol and cause an increase of stubborn fat stored in the belly. Not allowing your body to recover can increase the risk of injury too, so make sure you factor in rest days to your plan."

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