Does Fasting Help You Grow Taller? Evidence and Guidance

Fasting does not help you grow taller. There is no credible evidence that fasting, including intermittent fasting, adds height what helps you to grow taller. There is no credible evidence that fasting, including intermittent fasting, adds height. If you are still growing, aggressive calorie restriction or prolonged fasting can actually suppress the hormones responsible for linear growth and reduce the nutrients your bones need to lengthen. If your growth plates have already closed, nothing changes your height anyway. The best thing you can do for height potential is eat enough, sleep enough, and let your endocrine system do its job.

Quick answer by age: teens vs adults

Your age determines almost everything here, so it helps to separate the two situations clearly before getting into the science.

If you are a teenager asking whether to try intermittent fasting to get taller, the answer is a firm no. If you are an adult wondering the same, the answer is also no, but for a completely different reason: the mechanism for getting taller no longer exists in your body regardless of what you eat or don't eat.

How height growth actually works

Linear height comes from the growth plates, which are zones of cartilage near the ends of your long bones (femur, tibia, humerus, and others). Specialized cells in those plates, called chondrocytes, multiply and then get replaced by bone tissue, physically pushing the bone longer. This process runs until the growth plates fuse, typically somewhere in the mid-to-late teens for girls and the late teens to early twenties for boys, depending on puberty timing.

The whole system is driven by hormones. Growth hormone (GH) is released in pulses from the pituitary gland, and it triggers the liver to produce insulin-like growth factor 1 (IGF-1), which is the main signal that tells the growth plates to keep dividing. Thyroid hormones set the metabolic pace that allows this process to run efficiently. Sex hormones (estrogen and testosterone) drive the pubertal growth spurt but also eventually cause the growth plates to fuse and close. The Endocrine Society notes that delayed or absent puberty can significantly slow height gain in adolescents, which shows just how central this hormonal cascade is to linear growth.

Genetics set the ceiling. Nutrition and sleep determine how close you get to it. No intervention, fasting included, lets you blow past your genetic ceiling once the plates close.

What fasting and intermittent fasting actually change in the body

Fasting does produce real hormonal shifts. GH secretion increases during fasting states, which is one of the reasons people started associating fasting with growth in the first place. But here is the problem: fasting also suppresses IGF-1, and IGF-1 is the hormone that actually does the work at the growth plates. Research shows that in fasted individuals, infusing IGF-1 rapidly shuts down that elevated GH pulsatility, illustrating that the two signals are in a feedback loop. A systematic review and meta-analysis confirmed that caloric restriction and fasting reduce circulating IGF-1 levels in humans. So the hormone most people point to as the growth-fasting connection (GH) goes up, while the downstream effector that matters for bone growth (IGF-1) goes down.

Energy restriction also suppresses thyroid hormone (T3 drops) and leptin, both of which support normal anabolic signaling. This pattern, sometimes called GH resistance, is well documented in states of low energy availability: GH secretion rises as a kind of metabolic stress response, but target tissues including the growth plates become less responsive to it, and IGF-1 falls. The net effect is not a growth boost; it is a growth slowdown.

Does fasting help or hurt linear growth? The evidence-based take

The evidence consistently points toward harm, not benefit, for linear growth when energy availability drops significantly. A case report documented that height growth velocity improved after a child stopped a carbohydrate-restrictive diet, suggesting the restriction had been limiting growth velocity. The Female Athlete Triad and the broader Relative Energy Deficiency in Sport (RED-S) framework show that low energy availability, even without clinically diagnosable eating disorders, produces measurable hormonal suppression that impairs bone health and development. The AAP has flagged that dieting in adolescents can progress to prolonged caloric insufficiency, and that such states carry real physiological consequences.

Importantly, research on intermittent fasting's effects on bone health is still inconclusive. A recent review described these effects as unclear and controversial, and existing intermittent fasting trials were conducted almost exclusively in overweight or obese adults, not in growing adolescents. There is simply no study showing that intermittent fasting increases linear bone growth in humans. The elevated GH signal during fasting is not proof of a growth benefit because without adequate IGF-1 and substrate (protein, calories, calcium), the growth plates cannot respond.

To put it plainly: fasting does not help you grow taller, and during active growth it introduces real hormonal and nutritional conditions that work against reaching your genetic height potential.

What your body actually needs to grow: nutrients that matter

If you want to maximize height during a growth window, your focus should be on providing the raw materials and hormonal environment that make growth possible. Restriction of any kind works against that goal.

Calories: the foundation everything else sits on

Inadequate calorie intake is one of the clearest drivers of growth faltering. The Merck Manual links nonorganic growth faltering directly to insufficient calorie intake and uses BMI-for-age Z-scores below negative 2 as a clinical flag for significant undernutrition risk. Growing teens need substantial energy, typically more than adults of similar weight, because the body is running normal metabolic functions and building new bone and tissue simultaneously. Cutting calories during this period is not neutral; it actively competes with growth.

Protein: the building block for bone and muscle

Protein provides the amino acids needed for collagen synthesis in bone matrix, for IGF-1 production in the liver, and for muscle growth that keeps pace with skeletal growth. Fasting inherently reduces protein intake windows and, in more aggressive forms, can lead to lean mass catabolism. Adolescents benefit from consistent protein availability across the day, not compressed eating windows that make hitting protein targets harder.

Calcium and vitamin D: bone mineralization requires both

Bone length requires bone density to be structurally sound. Calcium and vitamin D are the two most critical micronutrients for bone mineralization. Vitamin D facilitates calcium absorption in the gut, and without adequate vitamin D, even a high-calcium diet delivers diminishing returns. Skipping meals reduces opportunities to consume these nutrients across the day, and very low-calorie diets are frequently deficient in both. Dairy, fortified plant milks, leafy greens, fatty fish, and egg yolks are practical food sources worth prioritizing. This connects closely to the broader conversation about what specific nutrients help you grow taller, which goes well beyond just calcium. Carrots are often suggested as a healthy vegetable, but they are not proven to increase height or reopen closed growth plates specific nutrients help you grow taller. Leafy greens and other nutrient-dense vegetables support bone health by helping you maintain adequate intake of vitamins and minerals like calcium and vitamin D specific nutrients help you grow taller.

What to actually do if you want to maximize your height potential

Here are the evidence-backed levers that genuinely support growth, especially during the teen years when growth plates are open.

1. Sleep 8 to 10 hours every night. The American Academy of Sleep Medicine consensus statement recommends 8 to 10 hours of sleep per 24 hours for teens aged 13 to 18. GH is released primarily in deep sleep, so consistently cutting sleep short directly reduces the hormonal driver of growth.
2. Eat enough total calories for your age, sex, and activity level. Do not run a calorie deficit during active growth phases unless a physician has specifically directed it for a medical reason.
3. Hit your protein target every day. Aim for at least 0.7 to 1 gram per pound of body weight as a general starting point for active growing teens, spread across meals.
4. Get enough calcium and vitamin D. Teen recommendations for calcium are 1,300 mg per day. Vitamin D recommendations vary, but ensuring adequate sun exposure or dietary intake matters for absorption.
5. Move in ways that load the skeleton. Weight-bearing exercise like walking, running, jumping, and resistance training applies mechanical stress that supports bone remodeling. This is not the same as compressing the spine; it actually supports healthy bone development.
6. Avoid aggressive restriction during puberty. This is the single most important thing to not do. Restrictive diets, prolonged fasting, and very low calorie protocols during active growth are not neutral; they suppress IGF-1, reduce nutrient availability, and can impair growth velocity.
7. If you are concerned about your growth rate, see a doctor. Endocrine evaluation can identify whether any hormonal or nutritional issue is actually limiting your height, and treatment options exist for specific diagnosed conditions.

Intermittent fasting dos and don'ts if you are still growing

Intermittent fasting has real, evidence-supported benefits for metabolic health in adults, particularly in the context of obesity or insulin resistance. That context matters. What works well for an overweight adult is not automatically appropriate for a growing 14-year-old. The AAP has specifically noted that weight loss efforts in adolescents should be medically monitored to avoid the risks of semistarvation, and that athletes and their families should seek medical and nutritional assessment before starting any weight-loss plan.

If you are under 18 and still growing

• Do not follow extended fasting protocols (16: 8, 5:2, or longer) without direct medical supervision. These windows can make it very difficult to meet calorie, protein, calcium, and micronutrient needs during a growth window.
• Do not skip breakfast before school if that is your main opportunity for a nutritious, protein-rich meal.
• Do prioritize eating regularly timed meals that cover your full nutrient needs.
• Do talk to a pediatrician or registered dietitian if you have concerns about weight or body composition rather than self-directing a fasting protocol.
• Do not interpret the GH spike seen in short-term fasting studies as proof that fasting helps you grow. That elevated GH is a stress response, not a growth signal, when IGF-1 is simultaneously suppressed.

If you are an adult with closed growth plates

• Intermittent fasting will not change your height in any direction. That mechanism is closed.
• If you choose to fast for metabolic health reasons, aggressive long-term caloric restriction can reduce bone density over time, so ensure you are still meeting calcium and vitamin D needs within your eating window.
• Do not start intermittent fasting expecting height-related benefits. There are none to be had.

The bottom line on fasting and height

Fasting does not make you taller. The elevated GH seen during fasting sounds promising, but it does not translate into linear growth because IGF-1, the actual driver at the growth plates, drops at the same time. For growing teens, adequate calories, protein, calcium, vitamin D, and sleep are the proven variables. Restricting any of those risks leaving height on the table permanently. For adults, the growth window is closed and no dietary strategy reopens it. If maximizing height is the goal, the playbook is not about fasting; it is about consistently fueling growth with the right nutrients, at the right amounts, while the window is still open. Understanding which specific foods and nutrients support that process is worth exploring further, because the details of what to eat matter just as much as avoiding restriction.