Evidence-based articles on calories, nutrition and fitness — written for Saudi and Gulf readers. Every number is backed by a reference you can check yourself.
World Health Survey 2019: 20.2% obesity and 38.2% overweight among Saudi adults. The real causes and a practical starting plan — with references.
Population healthIDF Diabetes Atlas: MENA has the highest comparative prevalence at 18.1%, with Saudi Arabia among the top ten. What that means for you practically.
Population healthNational survey: only 44.7% of people with hypertension were aware of it, and only 37% had it controlled. The numbers and the dietary solution.
Population healthSaudi meta-analysis: pooled prevalence 16.8% among adults and 58% among people with diabetes. And our region leads the world at 32%.
NutritionA five-year study: 67.3% prevalence of vitamin D deficiency in Saudi Arabia, with systematic analyses ranging from 63% to 81%. Why it happens and what to do.
NutritionA Lancet series of systematic reviews commissioned by the WHO: high fibre intake reduces mortality, diabetes and heart disease. Where do we get it from our own food?
NutritionA clinical study on five date varieties in healthy people and those with diabetes: glycaemic index is low (43–55). But quantity changes everything.
NutritionThe PREDIMED trial on 7,447 people: a Mediterranean diet with extra-virgin olive oil cut heart attacks, strokes and cardiovascular deaths by about 30%.
NutritionOfficial recommendation: under 10% of daily energy from free sugars, ideally under 5% (about 25 grams). How to count it in our drinks.
NutritionA 10-week randomised trial: fermented foods raised microbiome diversity and lowered inflammatory markers — while fibre alone was not enough over that period.
NutritionThe American Heart Association recommends one to two servings weekly. Analyses suggest two 150g servings may lower cardiovascular risk by around 8%.
NutritionA University of Sydney study on 38 isocaloric foods: boiled potatoes 323%, fish 225%, porridge 209% — and the croissant at the bottom.
NutritionUSDA studies: about 25% fewer calories absorbed from almonds, 21% from walnuts and 16% from cashews than the label predicts. Why?
NutritionGlycaemic index: 64 for white, 55 for brown. But a meta-analysis found the switch didn't change HbA1c — it reduced weight and raised HDL instead.
RamadanMeta-analysis: fasting reduces weight by 1.24 kg on average, but most of it returns within 2–6 weeks after Eid. How to make the Ramadan gain last?
RamadanAn applied Ramadan plan built on evidence for satiety, protein, water and movement — while avoiding the biggest trap: the weeks after Eid.
Women's healthSaudi studies: iron deficiency anaemia prevalence 30–56%, and 40.5% among adolescent girls in Riyadh. Overlooked symptoms and the dietary solution.
Women's healthLocal studies: 30–50% of Saudi women over forty develop osteoporosis, and 60% have calcium intake below requirements.
Women's healthLocal studies estimate PCOS prevalence between 16% and 32.5% depending on the sample. Insulin resistance is the key, and lifestyle change is the first treatment.
Women's healthSaudi studies: a quarter to a third of adolescent girls score high on the Eating Attitudes Test. Warning signs and when to seek help.
Women's healthA review of 19 studies: intake rises about 10% (240 kcal) in the luteal phase. The reason: a corresponding rise in energy expenditure.
Children's healthNational school screening data for over 1.13 million students: 10.4% overweight, 10.7% obesity, 4.5% severe obesity. A practical guide for parents, with references.
Children's healthA Saudi youth study: an average of 7 hours of screen time daily. And the Arab Teens Lifestyle Study: 82% of girls are sedentary. What can parents do?
Children's healthSystematic review: breakfast has a short-term positive effect on memory and attention, clearest in undernourished children — and a positive effect on classroom behaviour.
Children's healthA quarter of our students are above a healthy weight. But comments about bodies harm rather than help. The answer lies in changing the home environment — with evidence.
Food awarenessSince 2017: a 50% tax on soft drinks and 100% on energy drinks. Studies show a genuine drop in consumption — and, more importantly, what to drink instead.
Food awarenessOur social culture is built on generosity and shared food. A practical guide grounded in eating behaviour science for reconciling hospitality with the scale.
Food awareness87.5% of us use delivery apps and 86.6% order fast food. The numbers come from Saudi studies — and how to make the apps work for you, not against you.
Food awarenessA randomised controlled trial at the US National Institutes of Health: identical presented calories and macros, yet participants ate 508 more calories and gained weight.
Food awarenessOfficial recommendation: do not use non-sugar sweeteners for weight control. The reasons, the limits of the recommendation, and what to drink instead.
Food awarenessSaudi studies record heavy consumption among adolescents and students, and the literature links high caffeine to cardiac rhythm disorders. The numbers and safe limits.
Food awarenessThe Saudi Food and Drug Authority now requires restaurants to display calories, a salt symbol and caffeine content — including on delivery apps. How to read them.
Food awarenessShort-term evidence: liquid calories are weakly satiating and poorly compensated for. But the long-term picture is more complicated than usually claimed.
Food awarenessUS national survey data: lunch out adds 158 calories, dinner 144. And regular home cooks consume less sugar and fat with no higher monthly cost.
Food awarenessKabsa isn't the enemy — the uncounted portion is. A practical guide built on evidence for portion size, satiety and eating order.
Physical activitySystematic reviews: physical inactivity reaches 50–85% among men and 73–91% among women in Saudi Arabia. Realistic solutions requiring no gym membership or European weather.
Physical activityWithout resistance training, 20–30% of lost weight comes from lean mass. Meta-analyses show resistance training alone preserves it.
Physical activityA meta-analysis of 15 international cohorts: steps lower mortality progressively, with benefit plateauing at 6,000–8,000 for older adults and 8,000–10,000 for younger ones.
Physical activityAn umbrella review in the British Journal of Sports Medicine: physical activity has medium effects on depression, anxiety and psychological distress versus usual care.
Physical activityAbout 70% of Hajj and Umrah rites are physical activity. Expected walking distances and a practical eight-week preparation plan.
Physical activityNon-exercise activity thermogenesis (NEAT) is the biggest variable in your daily burn. Mayo Clinic research: people with obesity sit 2.5 hours more per day.
Physical activityTraining a muscle twice a week beats once when volume is equated. Weekly volume increases growth — but with diminishing returns.
Physical activityMeta-analyses: 75 minutes of HIIT a week is associated with reduced body fat and waist circumference. 150 minutes of moderate cardio is the alternative for lower tolerance.
Physical activityMeta-analysis: any resistance training lowers mortality by 15%, with the optimum around 30–60 minutes a week. No extra benefit beyond 120 minutes.
Physical activity"Green exercise" is associated with higher enjoyment and greater intention to continue than indoor exercise. Good news for people who dislike gyms.
Physical activityBeginners gain 0.5–1 kg of muscle a month on average; strength improves within 2–4 weeks while visible change takes 6–12 weeks.
Physical activityThe common rule: losing 2% of your body mass impairs performance. But blinded studies show a more nuanced picture — and heat changes everything.
Physical activityMeta-analysis of 595,000 adults: sitting 10 hours daily raises mortality risk 34% after adjusting for activity. But 60–75 minutes of moderate activity eliminates the risk.
Physical activityA study: three daily bouts of stair climbing, three days a week for six weeks, raised peak oxygen uptake. The answer for people with genuinely no time.
Physical activityAnalyses: 3–6 mg/kg an hour before exercise improves endurance performance by 2–7%. How that translates into cups of coffee.
ProteinThe RDA is 0.8 g/kg, but research in older adults supports 1.0–1.2 and up to 1.2–1.6 g/kg to preserve muscle. A full guide with local Gulf sources.
ProteinA randomised crossover study of 44 trainees: a high-protein diet (over 3 g/kg) for six months produced no adverse effects on kidney function in healthy people.
ProteinProtein alternatives from our own kitchen for those reducing meat or watching their budget — with attention to the critical iron point.
ProteinMeta-analyses: it improves strength when combined with training for eight weeks or more, with no significant adverse effects. The documented doses and what you should know.
ProteinMeta-analysis: the protein-timing effect disappears once total daily intake is controlled. Timing groups were simply eating 25% more protein.
FundamentalsThe Mifflin-St Jeor equation is the most accurate per the ADA systematic review. Step-by-step explanation with a full worked example and activity multipliers.
FundamentalsA 12-week trial: 500 ml of water before main meals produced 1.3 kg more weight loss. The mechanism and details, with references.
FundamentalsMeta-analyses: about 1.5 kg loss with less fat mass, clearest in the 40–50 age group and short durations. And an NEJM trial reveals the decisive point.
FundamentalsMetabolic adaptation is real but smaller than claimed: about 92 kcal below predicted at the peak of dieting, falling to 38 after stabilisation. What to do at a plateau.
FundamentalsA 2024 UK study of 295 menu items: a 21% mean absolute difference between stated and measured energy. And two-thirds of people underestimate their meals.
FundamentalsGuidelines: 0.5–1 kg per week. And a study in elite athletes: the slower rate preserved more lean mass. Why speed costs you muscle.
FundamentalsThe MATADOR trial: intermittent restriction with two weeks dieting and two at maintenance produced more fat loss and better lean mass retention. And the difference between a break, a refeed and a cheat meal.
FundamentalsA meta-analysis of 7,884 participants: 1.44 kg additional loss over a year compared with diet alone. When they help and when they're a waste of money.
FundamentalsMeta-analysis: two to five minutes of light walking after eating lowers glucose spikes. And walking straight after a meal beats waiting.
FundamentalsBMI doesn't distinguish muscle from fat. Research: body fat percentage and waist circumference predict risk better — and a tape measure is enough.
FundamentalsA French study of over 40,000 adults: meal planners had higher diet quality, greater food variety and lower odds of obesity.
FundamentalsVisceral fat is associated with higher cardiac risk than BMI, waist circumference and subcutaneous fat. The difference between the two types and how to reduce it.
FundamentalsA reference guide that puts everything in the right order: from calculating your calories to keeping the result — with the scientific evidence linked at every step.
FundamentalsDon't change everything at once. A gradual four-week plan — one evidence-backed change per week.
FundamentalsA hundred articles and more than 300 references. These are the rules we held ourselves to, and how you can check us yourself.
LifestyleMeta-analyses: short sleep is associated with a 45–55% higher risk of obesity. Why it happens hormonally, and how to fix it in a late-night culture.
LifestyleA crossover trial in Cell Metabolism: the same calories eaten late meant more hunger, less energy expenditure, and altered fat-storage pathways.
LifestyleA complete plan for office work: breaking up sitting, exercise snacks, the work meal, and office coffee — all evidence-based.
LifestyleMuscle and bone decline, and protein needs rise. A practical guide for a stage that requires a different strategy from your twenties.
TreatmentsSTEP-1: about 14.9% loss. SURMOUNT-1: up to 22.5%. And the head-to-head SURMOUNT-5: 20.2% vs 13.7%. The figures and what isn't said about them.
TreatmentsA Saudi study: 75.8% excess weight loss after three years, with major improvements in glucose and lipids. Yet 71.2% of people would not consider it.
Behavioural scienceSystematic reviews and meta-analyses: digital self-monitoring supports weight loss, and adherence beats paper logging — and photo capture makes it easier.
Behavioural scienceThe National Weight Control Registry tracks thousands of successful maintainers over ten years. These are the six habits they share — and the riskiest moment in the journey.
Behavioural scienceClinical evidence: emotional eating is a critical risk factor for weight regain, and chronic stress alters cortisol reactivity. A practical plan that doesn't rely on willpower.
Behavioural scienceCochrane review: people eat more with larger portions and larger tableware. The latest analysis pinpoints when downsizing your plate works and when it doesn't.
Behavioural scienceThe evidence: people who experience weight stigma are 32% more likely to develop depression, avoid healthcare and exercise — and eat more, not less.
Behavioural scienceDaily weight-tracking studies record a consistent weekly rhythm. The good news: weekend indulgence doesn't prevent success — with one condition.
Behavioural science65% of studies found no increase in eating after exercise, and appetite is genuinely suppressed afterwards. But post-exercise "licensing" is the real trap.
Behavioural scienceLally's study: an average of 66 days to reach maximum automaticity, ranging from 18 to 254 days. And crucially: missing one day doesn't return you to zero.
Behavioural scienceA meta-analysis of 24 trials and 4,919 participants: significant benefits at longer follow-up. But the result differs strikingly between men and women.
Behavioural scienceSystematic review and meta-analysis: eating speed is associated with BMI and waist circumference. And chewing itself raises post-meal energy expenditure.
Behavioural scienceA trial on 60 people: vegetable soup before lunch reduced meal energy by 134 calories (20%). The reason: low energy density.
Behavioural scienceOne randomised trial found no significant difference; another found a large one favouring daily weighing. How to handle a conflict like this.
Behavioural scienceA prospective study: 61% gained weight on a 1–3 week holiday, and the gain persisted for six weeks after returning. Why such a small number matters.
MythsA BMJ meta-analysis of 13 randomised trials: breakfast skippers lost 0.44 kg more. But the story isn't an invitation to skip it — here's the correct reading.
MythsA comprehensive evidence review: 13 of 18 studies found no association between weight cycling and weight gain, and 12 of 14 found no adverse effect on metabolic rate.
MythsMeta-analysis: green tea reduces weight by 0.65 kg only, and caffeine alone shows no significant effect. The truth without the marketing hype.
MythsReviews conclude there is insufficient evidence that detox diets enhance toxin elimination, and biomarker studies find no consistent reduction attributable to a cleanse.
MythsHypothyroidism does lower metabolism, but the weight attributed to it is usually 5–10 lb and mostly water and salt. When the thyroid is the cause and when it isn't.
MythsA meta-analysis on Apple Watch: mean absolute error of 27.96% for energy expenditure. Studies record even larger errors for some devices and activities.
MythsThe DIETFITS trial in JAMA: no significant difference in 12-month weight loss between the two diets. So what does determine the outcome?
MythsA 12-week trial found no difference; a 2023 trial found greater trunk fat loss. What that means for your training in practice.
MythsNetwork meta-analysis: no measurable advantage of higher meal frequency on weight, fat or metabolic markers. The evidence is low-certainty and does not support the popular advice.
MythsSystematic reviews: no significant effect of post-exercise stretching on delayed onset muscle soreness at 24, 48 or 72 hours. What actually helps?
MythsUS guidelines removed the dietary cholesterol cap in 2015. But newer analyses conflict — here is the full picture, honestly.
MythsThe largest study in the field: no evidence that daily multivitamins reduce mortality risk in healthy adults. So when do they actually help?
Medical & legal disclaimer: Content on the FitCal blog is general education and awareness. It is not medical advice, a diagnosis, or a treatment plan, and it does not replace consulting a licensed healthcare practitioner who knows your case. Do not start or stop any medication, supplement, diet or training programme based on what you read here. Any mention of a drug, supplement or product is educational reporting of the scientific literature — not an advertisement or endorsement — and any doses cited are those used in the studies, not personal recommendations. Every figure is sourced at the bottom of each article so you can verify it yourself; if you spot an error, email us at fitcal@verokron.com and we will review and correct it. In Saudi Arabia, for health advice call 937; in an emergency call 997.