Many diet plans cut out entire food groups, which can create nutrient deficiencies as well as health problems. For instance, if the diet is very low in carbohydrates and you have type 1 diabetes or type 2 diabetes, it’s probably not a good fit. And if it’s too restrictive and you’re pregnant or breastfeeding, it’s not a good idea, either. Keep in mind that pregnancy is not a time for weight loss. Speak with your doctor before making any changes to your diet if you are pregnant or breast-feeding.
The 3 Day Diet is low calorie, but it certainly is not low-fat, low-salt, or low cholesterol, so it is not a healthy option for most people with certain medical conditions such as diabetes, hypertension, heart disease, and high cholesterol. If you are overweight, weight loss is key to managing these conditions. But it should be a healthy and sustainable weight loss that includes healthy nutrition and exercise.

Habits and cravings are the devil when it comes to dieting. Let's first deal with habits. Juge explains that it takes a good week or two to ease into dieting. "Fast food is so easy and there's a McDonald's on every corner. The hardest thing is to develop the new habit of preparing your meals and taking them with you." The first week is the most difficult, so prepare yourself for some challenges as you abandon your usual routine. For example, you might usually go out for a sub sandwich or burger at lunch. You'll now have to bring your food with you and resist the temptation of spicing up your meal with the Doritos in the vending machine or your usual can of Coke. It can be a real mental battle to stick to your food plan.
Keep in mind that the first time that you sit down and plan meals to lose weight the process will take a little longer. But once you have a system in place, you'll breeze through the ritual—you might even start to enjoy it. Getting organized feels good and reaching your weight loss goals feels even better. So take enough time to follow through with the prep steps to get used to your diet plan and stay on track. 
Some diet plans, such as the MIND diet and the DASH diet, are meant to focus on certain areas of health — and weight loss may be a bonus. Others are created with weight loss as a primary goal. “It is important to remember that we are all very unique individuals,” says Kyle. “We all have different states of health and different lifestyles, which could affect what diet plan is best for us. That means that you should not be considering what is working for your friends or family members — and instead should pay attention to what works for you individually.”
To reach your get-lean goal, you must also follow a get-lean diet, filled with the best foods to burn fat. Why? Even if you work out hard for an hour every day, that still leaves 23 more hours for you to wreck all your hard work in the gym with just one slip-up: a measly handful of chips, a beer with the guys, or a burger at lunch. Diet is a huge, so to speak, part of the fat-loss equation. It's the backbone of your entire plan, the foundation of a hard body.
"Anytime you’re stressed, you probably go for food," Dr. Seltzer says. (Have we met?!) That’s because cortisol, the stress hormone, stokes your appetite for sugary, fatty foods. No wonder it’s associated with higher body weight, according to a 2007 Obesity study that quantified chronic stress exposure by looking at cortisol concentrations in more than 2,000 adults’ hair.
Diet plans can be a great resource for people looking to lose weight or streamline their nutrition. When choosing one program over the other, think about the individual foods allowed on the diet—if you must source some ingredients yourself, does this fit into your budget? Do the meals satisfy your preferred tastes, and do they incorporate alternatives for food allergies or sensitivities?
The fad military diet consists of low-calorie, odd food pairings such as bun-less hot dogs with banana, carrots, and broccoli. “Any diet like the military diet that severely limits the amount of calories you consume or eliminates one or more entire food groups puts any individual at risk for nutrient deficiencies,” says Kyle. “This can be more harmful than holding onto those 10 extra lb you’re trying to lose.” (32)

Ready to step it up with your Fitbit tracker and set some new health and fitness goals? That’s awesome! Cue the fireworks! But if your ultimate goal is to lose weight, unfortunately, activity alone isn’t going to get you there—you also have to change what you eat. That does not mean you need to do a cleanse or detox. But it is possible to get a jump on weight loss, the smart and healthy way. Fitbit Dietitian Tracy Morris developed this kickstart one-week meal plan to help her clients see results, fast. Disclaimers: Please don’t try to lose more than 2 pounds per week, or dip below 1200 calories per day, which can compromise your metabolism. This is not a long-term plan, so you definitely don’t want to eat this way every week. But it’s a great way to kick off a weight loss goal, with specific meal and snack ideas, so you’ll see an initial drop—and be extra motivated to keep the momentum going this year. Increase your drive to succeed, and see how many consecutive days your can stay on track, by using Fitbit’s food logging feature.
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