has anyone continued to lose weight while eating white rice?

White rice actually has an equal or better nutritional yield & also has a better nitrogen-retentive effect than brown rice. This is because the fiber & phytate content of brown rice act as antinutrients, reducing the bioavailability of the micronutrients it contains. Since no one is reading the fricking link, I'll just lay things out here:

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Comparison of the nutritional value between brown rice and white rice

Callegaro Mda D, Tirapegui J. Arq Gastroenterol. 1996 Oct-Dec;33(4):225-31.

Cereals are considered an important source of nutrients both in human and animal nourishment. In this paper nutritional value of brown rice is compared to that of white rice in relation to nutrients. Results show that despite higher nutrients contents of brown rice compared to white rice, experimental data does not provide evidence that the brown rice diet is better than the diet based on white rice. Possible antinutritional factors present in brown rice have adverse effects on bioavailability of this cereal nutrients.

http://www.ncbi.nlm.nih.gov/pubmed/9302338

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Effects of brown rice on apparent digestibility and balance of nutrients in young men on low protein diets

J Nutr Sci Vitaminol (Tokyo). 1987 Jun;33(3):207-18. .Miyoshi H, Okuda T, Okuda K, Koishi H.

The effect of brown rice with low protein intake was studied in five healthy young men. Feces were weighed, the digestibility of nutrients was determined, and blood tests were made. Each subject followed a diet consisting mainly of polished rice for 14 days and one consisting mainly of brown rice for 8 days. Both diets contained 0.5 g protein per kg of body weight. The brown rice diet had 3 times as much dietary fiber as the polished rice diet. On the brown rice diet, fecal weight increased, and apparent digestibility of energy, protein, and fat decreased, as did the absorption rates of Na, K, and P. The nitrogen balance was negative on both diets, but more negative on the brown rice diet. The phosphorus balance on the brown rice diet was significantly negative, but other minerals were not affected by the diet. The levels of cholesterol and minerals in the plasma were not significantly different on the polished rice diet and the brown rice diet. Comparing these results with data on standard protein intake (Miyoshi, H. et al (1986) J. Nutr. Sci. Vitaminol., 32, 581-589.), we concluded that brown rice reduced protein digestibility and nitrogen balance.

http://www.ncbi.nlm.nih.gov/pubmed/2822877

I personally prefer brown rice but as long as you count it into your calories it should be ok. But as others have said, the unprocessed brown rice will have more nutrients.