Search online for weight loss or diabetes reversal and you’ll run into the ketogenic diet, commonly called keto. Some people call it a metabolic miracle. Others warn it’s dangerous.
After more than a decade coaching overweight clients, diabetics, and people with metabolic syndrome here in Metro Manila, my answer is simple: keto can work, but it isn’t always the best long-term approach. In many cases, a moderate low carb diet is safer, easier to sustain, and delivers the same benefits.
This article covers what keto actually is, whether it’s safe, who should avoid it, and why I usually recommend low carb over strict keto for most Filipino clients. For the foundational principles behind carbohydrate restriction, start with my complete low carb guide.
Keto is a very low carbohydrate diet designed to push your body into a metabolic state called nutritional ketosis. Normally your body runs on glucose from carbohydrates. Once carb intake drops below roughly 20 to 50 grams a day, your liver starts converting fat into ketones (beta-hydroxybutyrate, acetoacetate, and acetone), which become your body’s backup fuel.
Once ketones rise in your bloodstream, your body shifts into fat-burning mode. That shift is why keto often produces rapid weight loss and lower blood sugar. For the full biological mechanism, insulin’s role, and how fat-burning mode actually works, see how keto works in the body.
Keto isn’t a separate diet from low carb. It’s the strictest end of it. All keto diets are low carb, but not all low carb diets are keto.
| Standard low carb | Ketogenic diet | |
|---|---|---|
| Daily carbs | 50 to 150g | 20 to 50g |
| Tracking | Loose, flexible | Strict, requires tracking |
| Fat intake | Moderate | High |
| Sustainability | Easier long-term, socially flexible | Harder to sustain |
This is exactly why I focus mainly on low carb strategies on lowcarb.ph rather than strict keto. Most Filipino clients do better with the flexibility, including the occasional small portion of rice.
Keto actually started as a medical therapy, not a weight-loss trend. Doctors originally used it to treat drug-resistant epilepsy in children. In the last decade, research has shown it may also help type 2 diabetes, insulin resistance, obesity, and metabolic syndrome.
A 2020 systematic review and meta-analysis in Nutrition & Diabetes found that ketogenic diets produced meaningful reductions in HbA1c, body weight, BMI, and systolic blood pressure in people with type 2 diabetes. Separately, Hallberg and colleagues’ continuous care intervention study (Diabetes Therapy, 2018) found that 60% of participants achieved diabetes remission after one year, and 94% of insulin users reduced or eliminated their insulin dose entirely. Results like these explain why keto gets so much attention online. That said, strong results in a study don’t automatically mean keto is the right fit for everyone.
Keto can be safe, but only when it’s done properly and for the right person. The same research that shows improvements in blood glucose, triglycerides, HDL cholesterol, and weight loss also points to real risks that social media rarely mentions.
This is the most common problem in the first month of keto. When carbs drop, your body burns through glycogen fast, and glycogen holds water. Once glycogen empties out, water and electrolytes go with it. That can cause dizziness, heart palpitations, fatigue, muscle cramps, and headaches.
In my coaching experience, most keto failures happen in the first 30 days, and it’s almost always because people aren’t replacing electrolytes. The three minerals to watch:
A well-designed keto or low carb diet should include mineral-rich foods, leafy vegetables, proper hydration, and sometimes magnesium or potassium supplementation.
Strict keto cuts out fruits, legumes, certain vegetables, and whole grains. Some studies show that translates into lower fiber and micronutrient intake compared to a more moderate approach. That’s one more reason I lean toward moderate low carb rather than extreme keto for long-term health.
Keto tends to improve triglycerides and HDL cholesterol, but some people see their LDL cholesterol rise on a very high-fat diet. That’s why lipid monitoring matters if you’re staying on keto long-term.
Keto can drop blood sugar fast. That sounds like a win, but it’s genuinely dangerous for anyone on insulin or sulfonylureas, since those medications can trigger hypoglycemia if carbs suddenly drop without a dosage adjustment. Anyone on diabetes medication should loop in their doctor before starting keto or even a stricter low carb approach.
One of my long-standing clients, already managing diabetes for years, moved to a ketogenic diet under close monitoring. After several months, his HbA1c dropped to 5.5% and his insulin requirement fell by 43%, with blood glucose staying stable in his target range. That’s a real example of how powerful carbohydrate restriction can be for metabolic disease.
But the same case also showed his LDL cholesterol climbing, which is exactly why I don’t recommend strict keto without ongoing lipid and glucose monitoring.
Keto isn’t appropriate for everyone. Use extreme caution or avoid it entirely if you’re pregnant, have a history of an eating disorder, have severe kidney disease, or have certain metabolic disorders. In these cases, a moderate low carb approach is the safer route.
After coaching hundreds of clients over the past decade, here’s what I’ve noticed: most people don’t actually need ketosis to get healthy. They just need to cut back on refined carbohydrates.
Plenty of my clients get dramatic results with moderate low carb alone: weight loss, lower blood sugar, reduced blood pressure, and better energy, without the strict limitations of keto. For many Filipinos, moderate low carb also allows some cultural flexibility, including small portions of rice when needed. That flexibility is what makes it sustainable, and sustainability matters more than short-term results.
Vitamin D3 and K2. Vitamin D deficiency is extremely common, and low levels are linked to insulin resistance, metabolic syndrome, and cardiovascular disease. Vitamin K2 works alongside D3 by directing calcium into bones instead of arteries.
Potassium. Regulates nerve signaling, heart rhythm, and blood pressure. Low carb diets increase your potassium needs since lower insulin means your kidneys excrete more sodium and water. Good sources: avocado, spinach, mushrooms, and leafy greens. If sourcing these fresh is the hard part, we deliver organic versions of most of them through our produce store.
Magnesium. One of the most common deficiencies overall. Low magnesium shows up as muscle cramps, fatigue, headaches, and poor sleep, and it matters most in the first few weeks of carb restriction.
If you’re curious about keto but not sure you want to jump straight into it, start with moderate low carb instead:
Most people see major improvements without ever needing to reach ketosis. And if you do decide to go stricter later, you’ll already have the habits in place. For a full breakdown of how long a keto phase should realistically last, see how long you should stay on keto.
Most people need to stay under 20 to 50 grams of net carbs a day to reach and stay in ketosis. Your exact number depends on your activity level and insulin sensitivity, so some people can go slightly higher and still stay in ketosis.
Not inherently. Cholesterol can shift in complex ways on keto, with triglycerides and HDL usually improving while LDL is less predictable. See does low carb raise cholesterol for what those lab changes actually mean. If you have kidney disease, talk to your doctor first, since keto changes how your body processes protein and electrolytes.
Only with medical supervision. Keto can drop blood sugar fast, and insulin or sulfonylureas can trigger dangerous hypoglycemia if your dosage isn’t adjusted alongside your diet.
Most people reach ketosis within 2 to 4 days of staying under 50 grams of carbs, though it can take up to a week depending on your activity level and how strict you are.
Not necessarily. Research shows both approaches produce similar weight loss over time. Keto tends to work faster at first, but moderate low carb is usually easier to sustain long-term.
