The chemical reactions in a body are known as metabolism. A person’s metabolism keeps their body functioning at its optimal level. It’s interesting to know that many people use the word metabolism also to define metabolic rate, which is the number of calories burned. The higher the number of calories burned, the easier it is to lose weight and keep it off for good. The Body Reboot book also discusses other ways to lose weight and get healthy, which is through implementing a low carb, high-fat diet. Having a high metabolism also keeps a person healthy by providing energy. Furthermore, it also assists in increasing results on a low carb diet. Here are 7 ways to improve a body’s metabolism:

Eat Protein

Eat protein to boost your metabolism and also feel fuller for longer. Eating protein on the keto diet is essential, but just make sure you’re getting enough fat. You should be eating fatty and healthy meats to keep you in ketosis (when your body burns fat instead of glucose).

Eating food can increase your metabolism for a few hours.

This is called the thermic effect of food (TEF). It's caused by the extra calories required to digest, absorb and process the nutrients in your meal.

Protein causes the largest rise in TEF. It increases your metabolic rate by 15–30%, compared to 5–10% for carbs and 0–3% for fats.

Eating protein has also been shown to help you feel more full and prevent you from overeating.

One small study found that people were likely to eat around 441 fewer calories per day when protein made up 30% of their diet.

Eating more protein can also reduce the drop in metabolism often associated with losing fat. This is because it reduces muscle loss, which is a common side effect of dieting.

A few studies also revealed that protein helps prevent overeating (Am J Clin Nutr. 2006 and Cell Metab. 2006):

An HP diet, compared with an AP diet, fed at energy balance for 4 d increased 24-h satiety, thermogenesis, sleeping metabolic rate, protein balance, and fat oxidation. Satiety was related to protein intake, and incidentally to ghrelin and GLP-1 concentrations, only during the HP diet.

Dietary protein enhances satiety and promotes weight loss, but the mechanisms by which appetite is affected remain unclear. We investigated the role of gut hormones, key regulators of ingestive behavior, in mediating the satiating effects of different macronutrients. In normal-weight and obese human subjects, high-protein intake induced the greatest release of the anorectic hormone peptide YY (PYY) and the most pronounced satiety. Long-term augmentation of dietary protein in mice increased plasma PYY levels, decreased food intake, and reduced adiposity. To directly determine the role of PYY in mediating the satiating effects of protein, we generated Pyy null mice, which were selectively resistant to the satiating and weight-reducing effects of protein and developed marked obesity that was reversed by exogenous PYY treatment. Our findings suggest that modulating the release of endogenous satiety factors, such as PYY, through alteration of specific diet constituents could provide a rational therapy for obesity.

WebMD adds to this study and also mentions how protein can increase your metabolism:

Your body burns many more calories digesting protein than it does eating fat or carbohydrates. As part of a balanced diet, replacing some carbs with lean, protein-rich foods can boost metabolism at mealtime. Good sources of protein include lean beef, turkey, fish, white meat chicken, tofu, nuts, beans, eggs, and low-fat dairy products.

High-Intensity Workouts

High-intensity interval training (otherwise known as HIIT) is a type of workout that includes quick and intense bursts of activity. It helps burn more fat during and after your workout as well as increases your metabolic rate. A few studies discuss this finding more in-depth (Sports Med Open. 2015, Int J Sport Nutr Exerc Metab. 2012).

BACKGROUND:
The purpose of this study was to examine the effect of exercise modality and pre-exercise carbohydrate (CHO) or protein (PRO) ingestion on post-exercise resting energy expenditure (REE) and respiratory exchange ratio (RER) in women.

METHODS:
Twenty recreationally active women (mean ± SD; age 24.6 ± 3.9 years; height 164.4 ± 6.6 cm; weight 62.7 ± 6.6 kg) participated in this randomized, crossover, double-blind study. Each participant completed six exercise sessions, consisting of three exercise modalities: aerobic endurance exercise (AEE), high-intensity interval running (HIIT), and high-intensity resistance training (HIRT); and two acute nutritional interventions: CHO and PRO. Salivary samples were collected before each exercise session to determine estradiol-β-17 and before and after to quantify cortisol. Post-exercise REE and RER were analyzed via indirect calorimetry at the following: baseline, immediately post (IP), 30 minutes (30 min) post, and 60 minutes (60 min) post exercise. A mixed effects linear regression model, controlling for estradiol, was used to compare mean longitudinal changes in REE and RER.

RESULTS:
On average, HIIT produced a greater REE than AEE and HIRT (p < 0.001) post exercise. Effects of AEE and HIRT were not significantly different for post-exercise REE (p = 0.1331). On average, HIIT produced lower RER compared to either AEE or HIRT after 30 min (p < 0.001 and p = 0.0169, respectively) and compared to AEE after 60 min (p = 0.0020). On average, pre-exercise PRO ingestion increased post-exercise REE (p = 0.0076) and decreased post-exercise RER (p < 0.0001) compared to pre-exercise CHO ingestion.

CONCLUSION:
HIIT resulted in the largest increase in REE and largest reduction in RER.

Six weeks (3 times/wk) of sprint-interval training (SIT) or continuous endurance training (CET) promote body-fat losses despite a substantially lower training volume with SIT. In an attempt to explain these findings, the authors quantified VO₂ during and after (24 h) sprint-interval exercise (SIE; 2 min exercise) vs. continuous endurance exercise (CEE; 30 min exercise). VO₂ was measured in male students (n = 8) 8 times over 24 hr under 3 treatments (SIE, CEE, and control [CTRL, no exercise]). Diet was controlled. VO₂ was 150% greater (p < .01) during CEE vs. SIE (87.6 ± 13.1 vs. 35.1 ± 4.4 L O₂; M ± SD). The observed small difference between average exercise heart rates with CEE (157 ± 10 beats/min) and SIE (149 ± 6 beats/min) approached significance (p = .06), as did the difference in peak heart rates during CEE (166 ± 10 beats/min) and SIE (173 ± 6 beats/min; p = .14). Total O₂ consumed over 8 hr with CEE (263.3 ± 30.2 L) was greater (p < .01) than both SIE (224.2 ± 15.3 L; p < .001) and CTRL (163.5 ± 16.1 L; p < .001). Total O₂ with SIE was also increased over CTRL (p < .001). At 24 hr, both exercise treatments were increased (p < .001) vs. CTRL (CEE = 500.2 ± 49.2; SIE = 498.0 ± 29.4; CTRL = 400.2 ± 44.6), but there was no difference between CEE and SIE (p = .99). Despite large differences in exercise VO₂, the protracted effects of SIE result in a similar total VO₂ over 24 hr vs. CEE, indicating that the significant body-fat losses observed previously with SIT are partially due to increases in metabolism postexercise.

Water, Coffee, and Tea

Of course, let’s not forget about water, which helps flush things out of your system, keeps you hydrated, and believe it or not, also improves your metabolism. WebMD discusses this more below:

Your body needs water to process calories. If you are even mildly dehydrated, your metabolism may slow down. In one study, adults who drank eight or more glasses of water a day burned more calories than those who drank four. To stay hydrated, drink a glass of water or other unsweetened beverage before every meal and snack. Also, snack on fresh fruits and vegetables, which naturally contain water, rather than pretzels or chips.

WebMD says that coffee is another thing that’ll improve your metabolism, and if you’re a coffee drinker who would like to stick to your diet this is good news!

If you're a coffee drinker, you probably enjoy the energy and concentration perks. Taken in moderation, one of coffee's benefits may be a short-term rise in your metabolic rate. Caffeine can help you feel less tired and even increase your endurance while you exercise.

Tea also has the same effect and is also packed full of antioxidants!

Drinking green tea or oolong tea offers the combined benefits of caffeine and catechins, substances shown to rev up the metabolism for a couple of hours. Research suggests that drinking 2 to 4 cups of either tea may push the body to burn 17% more calories during moderately intense exercise for a short time.

Keeping your metabolism going strong is a lot easier on the keto diet, a low carb, high-fat diet. HIIT is especially useful as it increases your metabolism even after you've completed your workout! You can learn more about the ketogenic diet in our book and right now we’re giving away free copies of the Body Reboot book! Help us cover the cost of shipping, and we’ll send you a free book. Check out this page to find out if there are any copies of the book left.  

Sources: VeryWellFit, Healthline, NCBI: Am J Clin Nutr. 2006, NCBI: Cell Metab. 2006, NCBI:
Sports Med Open. 2015, NCBI: Int J Sport Nutr Exerc Metab. 2012, WebMD