Stubborn Fat Despite Dieting? How Does ONDA Help Reduce It?

Have you ever lost weight, only to find that certain areas, like your upper arms, abdomen, or inner thighs, still seem unchanged?

Losing weight doesn’t always mean losing fat in the areas you’re most concerned about.

ONDA doesn’t reduce fat throughout the body. Instead, it directs heat energy toward a specific layer of fat beneath the skin. Let’s take a closer look at how ONDA works on fat cells, step by step.

How Does ONDA Deliver Energy to the Fat Layer?

• Selective Energy Delivery — ONDA uses 2.45 GHz microwaves that pass through the epidermis and dermis with relatively little absorption. Reports suggest that a substantial portion of the energy, around 80%, is absorbed in the subcutaneous fat layer.
• Water Molecule Movement and Frictional Heat — The microwaves cause water molecules within the tissue to move rapidly, billions of times per second. The resulting heat is said to raise the temperature of the fat layer to approximately 65–67°C, damaging and breaking down fat cell membranes.
• Epidermal Protection (Cooling System) — The handpiece has a contact cooling system designed to protect the skin’s surface while allowing heat to build up in the deeper fat layer without damaging the surface.
• Natural Clearance of Damaged Fat Cells — Fat cells damaged by heat are believed to be taken up by macrophages, a type of immune cell, and then cleared through the lymphatic system. Studies report that fat cells destroyed in this way generally do not regenerate.

ONDA’s 3 mm vs. 7 mm Tips: What’s the Difference?

The 3 mm and 7 mm measurements refer to the depth at which microwave energy from the handpiece is delivered. The 3 mm tip primarily targets the dermis, where it helps promote skin renewal and collagen production to improve the appearance of fine lines and skin texture. The 7 mm tip directs energy deeper, into the subcutaneous fat layer, to help reduce localized fat. The medical team selects the appropriate tip and adjusts the energy level based on the fat thickness and skin condition of each treatment area.

What ONDA Can Target: Subcutaneous Fat, Not Visceral Fat

Body fat is broadly divided into two types: subcutaneous fat and visceral fat. Subcutaneous fat lies just beneath the skin, while visceral fat sits much deeper, around the organs in the abdomen.

Now that we’ve looked at how ONDA works, you might be wondering whether it can also reach visceral fat. It cannot. Visceral fat lies too deep for even the 7 mm handpiece to reach. In fact, a common question is whether ONDA treatment on the abdomen can reduce visceral fat, but it has no effect on it. ONDA is better understood as body contouring: a treatment aimed at improving the appearance of localized fat and cellulite, rather than producing substantial weight loss on the scale.

ONDA is designed to refine your body contours rather than lower the number on the scale.

Treatment Areas and Energy Settings

ONDA may be considered for areas with more noticeable subcutaneous fat, including the upper arms, abdomen, inner thighs, and flanks. The choice of tip and energy setting depends on the thickness of the fat, the condition of the skin, and the treatment goal, even when treating the same area. The medical team assesses these factors before treatment.

How Is ONDA Different from Losing Weight?

Weight loss generally makes fat cells smaller and tends to affect the body as a whole. ONDA, by contrast, uses heat to target fat cells in specific areas. This makes it an option for localized fat that may remain even after you’ve lost weight. While it may reduce the number of fat cells in the treated area, ONDA is best understood as a body contouring treatment that focuses on specific areas, rather than a treatment measured by changes on the scale.

Common Misconceptions About ONDA

While it’s natural to hope for a noticeable change after one ONDA session, results typically develop gradually over a series of treatments.

It’s also easy to assume that ONDA can take the place of exercise. ONDA focuses on fat cells in specific areas, rather than managing overall body fat. Keeping that distinction in mind can help you set realistic expectations for treatment.

Keeping up healthy eating habits and staying active throughout your ONDA treatments may help keep the remaining fat cells from growing larger again.

How Many ONDA Sessions Are Typically Recommended?

ONDA is commonly performed as a series of treatments on each area, spaced about three to four weeks apart. This interval is generally explained as giving the body time to clear damaged fat cells through the activity of macrophages and the lymphatic system. Repeating treatment too soon may mean treating the area again before that process is complete. For this reason, following the recommended intervals consistently is often considered more effective than scheduling several sessions close together.

As we covered earlier, there is a limit to how deeply ONDA’s energy can reach. If the subcutaneous fat layer is thicker, a single session may not deliver energy to the deeper fat beneath it. Treatment is therefore approached gradually, working through the fat layer over time, and a course of three to five or more sessions may be recommended.

Planning ONDA Treatments Ahead of the Season

Many people plan ONDA treatments ahead of the season for short sleeves and lighter clothing. Because results develop gradually over multiple sessions, starting at least two to three months in advance is generally recommended. If you begin too close to the time you have in mind, it may be difficult to complete the recommended number of sessions beforehand.

What to Know Before Your ONDA Treatment

Results tend to develop gradually over two weeks to a month rather than appearing immediately. The extent and timing of results can vary from person to person. Before treatment, please let the medical team know about any underlying medical conditions or if you are pregnant.

Aftercare Tips Following ONDA Treatment

Staying well hydrated and gently massaging the treated area after your ONDA session are thought to support lymphatic circulation and help the body clear damaged fat cells. On the other hand, frequent overeating or irregular eating habits may cause the remaining fat cells to grow larger, making it harder to maintain the changes you hoped for.

While treatment may reduce the number of fat cells in the area, the cells that remain can still grow or shrink depending on your lifestyle habits.

Wondering whether ONDA is right for the area you’re concerned about? Our team at PRiA Clinic can help you explore your options through a personalized, one-on-one consultation.

Medical Information Notice — This column provides general medical information and does not recommend specific treatments. The appropriate treatment may vary depending on individual skin conditions and health status.