Jennifer Lawrence's Trainer Shares 7 Tips for a Faster Metabolism

jennifer lawrence metabolism design

Rich Fury / Design by Dion Mills

First, let's be honest. Even though it's the season for all the bikini/weight-loss/fat-burning talk, and yes, we're just about to divulge a trainer's top tips for speeding up your metabolism, we don't want to make it seem like losing weight or torching fat is a make-or-break factor when it comes to having a fabulous summer or increasing your body confidence. Because it's not, and we're also really into the idea of spreading all the body love this month.

That being said, does it have to be so black-and-white? To feel confident and happy, are we automatically supposed to dismiss every health or "diet" tip we see to protect ourselves? Burning fat is in no way synonymous with achieving health and confidence this summer, but truth be told, we're also not opposed to hearing top experts in the industry share wisdom on a topic which has left many of us bewildered and frustrated at one point or another.

So here's our strategy. We'll gladly listen to, share, and discuss their tips and know-how. Then, after the fact, we can decide if said tips and goals align with what we envision for both our physical and mental space this summer. Plus, we can each decide whether or not their recommended lifestyle changes equate to something that will be healthy for us in the long run. 

Thus, when we heard David Kingsbury (ahem, the celebrity trainer to Jennifer Lawrence, Jessica Chastain, and the cast of Wolverine) was offering up his best, most successful tips for a faster, fat-burning metabolism, we were intrigued.

Meet the Expert

David Kingsbury is a celebrity personal trainer and online fitness coach based at his private gym, Pinewood Film Studios in England. He has also opened a second commercial gym called K1 Fitness. He has trained some of the most well-known names in film, including Jennifer Lawrence, Hugh Jackman, Ryan Reynolds and Chris Hemsworth. 


His no-nonsense plan works for Lawrence, who has been open about the fact that she doesn’t like restrictive diets.  "I don't like when people say, 'I only do this or eat this,' Because I eat. I'm not very strict with my diet. If I want a piece of pizza, I eat a piece of pizza. But I do work out more than normal because I have a certain way that I want to look, and a way that I want to fit into my clothes,” she told Vogue in an interview.

In addition to exercise, Lawrence practices portion control to keep her calories in a healthy range (one slice of veggie pizza versus several slices of pepperoni, for example) and keeps plenty of healthy snacks on hand to keep her energy up and prevent her from getting "hangry." She snacks on hummus, vegetables, Greek yogurt and dark chocolate.

Kingsbury is known and loved by celebrities for his super-fast results (with no crash dieting). Read on to see his seven best tips that he shared with Healthista for climbing your way to an incinerator-level metabolism with as minimal peripheral damage (aka misery) as possible.

1. Up Your Protein Intake

Fish with pasta

Try increasing your protein intake so roughly 40% of your calories per meal come from lean, nutrient-dense sources like chicken, smoked salmon, tempeh, and beans. 

"Protein is very important for muscle maintenance during a fat-loss plan and keeping the levels high will ensure you keep hold of all that hard-earned muscle whilst you are losing body fat," Kingsbury explained to Healthista. 

2. Try Circuit Training Twice Per Week

person training in gym


For a hard-hitting and efficient full-body workout, circuit training is Kingsbury's go-to method to increase fat burn.

"The rest periods are kept very short in circuit training; these exercises put a high demand on your body, depleting your energy stores and boosting fat burning after the session," he says. He recommends starting with multitasking exercises like squats, push-ups, and lunges. 

Kingsbury recommends his clients do just two circuit training workouts per week for 30 minutes each, He recommends you do 12 sets of five exercises as many times as you can for 15 minutes, followed by a 15 minute incline walk on the treadmill. Check out this circuit training plan to get started.

3. Be Strategic With Carbs

bowl of vegetables and sweet potato

By now we know completely cutting out any food group is a nutritional no-no and rarely does the body good. In fact, healthy, complex carbohydrates (from unprocessed, plant-based foods) are essential for our energy output as they break down to produce glucose .

"This glucose is moved around the body to create fuel for muscles, brain, and other essential biological functions," Kingsbury explains. That being said, he also told Healthista keeping each meal ratio to about 20% carbohydrates might help boost metabolism and increase fat burn.   

4. Do One LISS Session for 60 Minutes Per Week

woman stretching

Meet low-intensity steady-state exercise. Unlike HIIT, which usually features a fast and furious workout block of heart-pumping exercises, LISS is typically done for over an hour per session and involves a form of exercise that gets the heart rate up, but not to as extreme a level (think walking on the treadmill or a slow-but-steady Spin session).

According to Kingsbury, LISS is great for fat burn as "it works by increasing your heart rate into a targeted fat-loss zone and keeps it there." Do as he suggests and strive to maintain your heart rate at 60% to 65% of your maximum heart rate throughout the one-hour workout.

5. Re-Evaluate Your Alcohol Consumption


According to Kingsbury, decreasing alcohol (or cutting it from your diet almost completely) will likely do wonders for your metabolism. (Extra-strong and salty margaritas do not make for a fast and healthy metabolism, sadly.)

Kingsbury's reasoning: "Alcohol supplies almost twice as many calories as equivalent amounts of protein and carbohydrates. Plus, it is an irritant to the lining of your stomach, gradually weakening your liver and kidneys. As the lining is weakened, the food you eat is digested less efficiently."

6. Make Your Plate 40% Fat

avocado toast

According to Kingsbury, fat has gotten a bad reputation in the past since it has the highest number of calories per gram compared to other macronutrients like carbohydrates and protein. That being said, he tells Healthista fat is essential for providing our bodies with the energy they need in order to function properly. Plus, it's highly satiating so you'll stay fuller for longer and will likely feel calmer around food in general

"Fat is actually one of the secret weapons for effective fat loss because it provides energy with the lowest impact on your blood sugar and insulin levels," Kingsbury confirms. 

7. Curb That Sweet Tooth


Prepare yourself because depending on the severity of your sweet tooth, we bear some somber news. According to Kingsbury, too much sugar is the number one reason most fat-loss efforts fail—especially when you consider we're not even aware of how much we may or may not be consuming

"Our brains don't register sugary, fatty, heavily processed foods in the same way as other foods, and we don't get the same 'I'm full' signals," Kingsbury clarifies. And while natural forms of sugar found in fruit get the green light (of course, moderation is key), it's added sugars which Kingsbury takes issue with. "Eating excessive amounts of added sugar can have harmful effects on your metabolism, which can lead to insulin resistance, belly fat, fatty liver disease, and heart disease." 

Our thought? Of course, it's completely healthy to indulge in something sweet occasionally, but try replacing your favorite processed picks (like from-a-box brownies) with something homemade instead.

Article Sources
Byrdie takes every opportunity to use high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial guidelines to learn more about how we keep our content accurate, reliable and trustworthy.
  1. Holesh JE, Aslam S, Martin A. Physiology, Carbohydrates. [Updated 2021 Jul 26]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2021 Jan-. Available from:

  2. Samra RA. Fats and Satiety. In: Montmayeur JP, le Coutre J, editors. Fat Detection: Taste, Texture, and Post Ingestive Effects. Boca Raton (FL): CRC Press/Taylor & Francis; 2010. Chapter 15. Available from:

  3. Faruque, S., Tong, J., Lacmanovic, V., Agbonghae, C., Minaya, D. M., & Czaja, K. (2019). The Dose Makes the Poison: Sugar and Obesity in the United States - a Review. Polish journal of food and nutrition sciences69(3), 219–233.

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