Losing those “last five kilograms” is one thing – pretty much anybody can adopt a restrictive diet for a few weeks and watch the number on the scale drop. But losing 25 or more kilograms is a very different proposition.

This type of weight loss isn’t just about changing a diet,” says Devon Golem, director of the Didactic Program in Dietetics, who’s helped patients achieve major weight-loss goals. “It’s about changing mindset, changing behaviors, and changing your environment, too. They all go together.”

Sounds intimidating, right? But trust us, even dramatic weight loss is absolutely doable. You just need a solid game plan that incorporates these 10 proven strategies for shedding significant weight sustainably.

Get Mentally Prepared

Before you even think about what’s on your plate, Golem explains, you have to be in the right mindset. Weight loss of 25 or more kilograms takes time, and it doesn’t always happen at a predictable rate. “You’re going to have times when you see dramatic change and then it’s going to plateau for a while,” she says. “It’s a staircase.” Knowing this ahead of time helps minimise disappointment during the weeks when you feel like you haven’t made progress.

Look at the Big Picture

You can’t just adopt a new diet and change nothing else in your life. “Things like sleep, exercise, and stress are all interconnected,” says Golem. “When you ignore one, it can sabotage the others.” One example: Overwhelming evidence shows that getting suboptimal sleep (less than 7 hours) spurs us to overeat. You’ll get the best results when you address all of the major imbalances in your life – not just your food. Get started with these 20 ways to sleep better tonight.

Forget Quick Fixes

When you want to lose 25 kilos, you need to morph your new dietary changes into lifelong habits. “You want to get to the point where eating in this new way becomes second nature and doesn’t overwhelm you,” Golem says. This takes time and practice, but you can set yourself up for success by thinking of every new dietary change as a lifelong habit-to-be. This mental shift will help you focus on healthy activities like realistic running plans and avoid quick fixes (e.g., juice cleanses) that clearly aren’t sustainable in the long term.

Take It One at a Time

Don’t overwhelm yourself by trying to create 18 new habits at once. Just start with one, Golem says – whether that’s drinking enough water, cutting out the 3 p.m. bag of chips, eliminating sugar from your morning coffee, or going for a daily run. Taking on too much too fast can lead to frustration. Start small and add new habits only when you know you can handle them. And if the idea of creating your own plan like this terrifies you, seek the help of a registered dietitian.

Feel the Feels

Hitting an objective weight loss target (I lost the first 5 kilograms! I dropped one pants size!) is great – but don’t get too caught up in the numbers. Golem suggests making a few subjective weight-loss goals, too. Do you want to feel lighter? Have more energy? Move more freely? Focusing on these unquantifiable measures of weight loss can give you extra motivation when you’re stuck in a plateau. So maybe you weigh the same as you did last week – but there’s a new spring in your step and you wake up feeling ready for the day! It pays to recognise these new feelings as rewards, Golem explains. Tuning in to them regularly will make you less likely to quit when the going gets tough.

Crowd out the Junk

Before you take “bad” foods like sweets away, try adding the things that your diet’s lacking. For most people, Golem says, that means vegetables and water; she recommends drinking up to four litres of water and eating seven to eight servings of veggies per day. ”The more you add, the more you’ll feel fulfilled instead of deprived,” she explains. Bonus: Ramping up water and veggie intake can give you benefits beyond weight loss, including improved digestion, stronger immunity, and a better mood.

Go Whole Grain

What’s one of the easiest ways to feel fuller faster? Replacing refined grains with fibre- and protein-rich whole grains. But don’t just swap white bread for whole wheat and call it a day. Typically these whole wheat versions have only a negligible increase in fibre, and most have the same number of calories as their refined counterparts. You’ll get the most fibre (and nutrients) when you eat intact whole grains, like quinoa, oats, brown rice, and amaranth, Golem says.

Get Plant-Powered

Let’s finally banish the idea that meat is the only way to get high-quality protein. “All the plant foods you’re eating are contributing to your protein intake,” Golem says. “People don’t believe it, but it’s true.” Getting more of your protein from plants (rather than animals) is doubly beneficial: You’ll reduce your calorie intake and consume more belly-filling fibre.

Get Portions Under Control

Nutritionists agree: How much you eat is just as important as what you eat, and eating reasonable portions is critical for weight loss. But it’s easy to overdo it when it comes to certain foods – who really eats just a ½-cup serving of cereal or 2 tablespoons of salad dressing?! Learning – and actually implementing – proper portion sizes will boost your weight loss efforts in the long run.

Forgive Yourself

No-one navigates a 25 kilogram weight loss without a few off days sprinkled in. But it’s imperative that you don’t let those little slip-ups derail your progress. “When you do have a bad day, it helps to step back, calm down, and recognise this is part of the learning process,” says Golem. “Think about learning to ride a bike and how many times you had to screw up in the beginning before mastering the perfect pedalling technique.” Don’t punish yourself – getting discouraged could prompt you to quit altogether. Just forgive and move forward.

The article Have More Than 50 Pounds To Lose? Here Are 10 Ways To Get Started originally appeared on Prevention.

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